Which dynasty was Bing Lin?

Are you asking who repaired Li Bing in Dujiangyan? Li Bing, a native of Yuncheng, Shanxi during the Warring States Period around 256 BC, was a water conservancy scientist during the Warring States Period and also studied astronomy and geography. At the end of Qin Dynasty (about 256 BC ~ 25 BC1year), he was responsible for the construction of Dujiangyan, an early irrigation project in China, at the exit of Minjiang River in Dujiangyan City, Sichuan Province (formerly guanxian), thus making the Chengdu Plain rich.

According to the Records of Huayang National Records, Li Bing once installed a water gauge of a stone man in Dujiangyan, which was an early water level observation facility in China. He also dug beaches and dredged waterways in today's Yibin and Leshan, built irrigation and shipping projects such as Wenjing River (now Xihe in Chongqing County), Mubai River (now Nanhe in Qionglai), Luoshui River (now Shiting River) and Mianshui River (now Mianyuan River), and also built cable bridges and opened salt wells. People miss his achievements and build temples to commemorate them. After the Northern Song Dynasty, there was a story about Li Bing's son, Li Erlang, who helped Li Bing manage water.

The Erwang Temple, built at the head of Dujiangyan Canal, commemorates the great achievements of Li Bing and his son in water control. Inscriptions are mostly technical essentials for the maintenance of irrigation projects. Every year in Tomb-Sweeping Day, local residents will hold sacrificial activities and boil water (water will be released after the annual renovation) at the Erwang Temple. Li Bing has now become a god worshipped by ordinary people in Dujiangyan Irrigation District, and religious activities related to water have strengthened the connection between the government and the water users in the irrigation area.