Qingjiang Bridge in Shuibuya is suspension bridge with the main span of 420 m，whose anchorage type of both sides is tunnel anchor.According to the geological conditions on both sides of the straits,research on the scheme of tunnel anchor,numerical simulation analysis and scale model test are carried out.Combining the construction survey results,the tunnel anchor structure size of both sides is determined.Changling shore left tunnel anchor length is 18 m,right tunnel anchor length is 24 m,the stability coefficient of surrounding rock of tunnel anchor is 5.5,the length of anchor body of sitiebian tunnel is 15 m,and the stability coefficient of surrounding rock of tunnel anchor is 7.This paper summarizes the main technical points of the tunnel anchor of suspension bridge in karst development area,which can be used as a reference for the application of the tunnel anchor structure of suspension bridge.