The butterfly island, located in the southwest corner of the north and south lakes, was artificially accumulated when dredging the south lake in 1988. The island is about 12 mu. Standing on the eagle-domed mountain, she looks like a butterfly. It is a "Salt Chao" to commemorate the film after Hu Dielai came to the North and South Lake in the 1930s in Shanghai to shoot a "Salt Chao" with the theme of the living conditions of the sea salt salt people. There is a exhibition hall on the island of Bu Xinsheng Reform Spirit, which records the life and management reform of Haiyan entrepreneur Bu Xinsheng in the early stage of the reform.