For the promotion of prestressed technology in lock engineering application, combining the specific application of the Yingshang lock, using three dimensional numerical simulation method, the crack resistance of prestressed dock-type lock chamber was detailed analyzed, the technical and economic advantages and disadvantages were discussed compared with the reinforced concrete lock chamber, and the corresponding improvements were also proposed. The results were shown that the prestressed dock-type lock chamber structure had certain advantages in the structure stress performance, durability and economy.