Aerial photo taken on Dec. 30, 2018 shows the winter scenery of Songhua Lake in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

A tourist takes selfies in Jilin Garden at the Beijing International Horticultural Exhibition in Yanqing District of Beijing, capital of China, May 23, 2019. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Li Xin)

Tourists visit the Jilin Garden at the Beijing International Horticultural Exhibition in Yanqing District of Beijing, capital of China, May 23, 2019. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Li Xin)

Aerial photo taken on May 12, 2019 shows wild birds swimming on Songhua Lake in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 11, 2019 shows a night view of Songhua River in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 11, 2019 shows a night view of Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 11, 2019 shows a view of Dongshan Culture &Sports Center in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 12, 2019 shows the scenery of Songhua Lake in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 12, 2019 shows a boat sailing on Songhua Lake in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 11, 2019 shows a night view of Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on Dec. 30, 2018 shows the winter scenery of Songhua Lake in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Stitched aerial photo taken on May 11, 2019 shows a view of Jilin City in northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on May 11, 2019 shows tourists taking sightseeing boats on the lake in Beishan Park of Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on Dec. 12, 2018 shows tourists viewing frost scenery in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Zhang Nan)

Aerial photo taken on May 11, 2019 shows the scenery of Songhua River in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)

Aerial photo taken on Dec. 12, 2018 shows tourists viewing frost scenery in Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Zhang Nan)

Aerial photo taken on May 11, 2019 shows tourists taking sightseeing boats on the lake in Beishan Park of Jilin City, northeast China's Jilin Province. As a province rich in ecological resources, Jilin has promoted the conservation of fertile soil, natural forest resources and water systems to lay a solid foundation for its sustainable development. Located at the intersection of Changbai Mountains and Songnen Plain, Jilin City, is an important water conserving area for the Songhua River basin. Many rivers and tributaries of the Songhua River, Lalin River and Mudanjiang River also run through the region. In recent years, the improved water quality of the Songhua River helps provide citizens in Jilin City with approaches to the nature, and boost tourism and city construction. The Beijing International Horticultural Exhibition kicked off its "Jilin Day" event on Thursday and will last until Saturday. (Xinhua/Xu Chang)