Temperature crack control is a key problem to be solved in the application of mass concrete. Structural crack will have a negative impact on the durability of concrete. In order to control the problem of mass concrete cracking，we pour the main hydraulic structures of Qianwei ship lock with the low heat cement concrete，and analyze the inspection results of physical samples，the temperature data collected on site and the actual effect of concrete. The results show that the hydration heat and the adiabatic temperature rise of concrete at each hydration age are lower than these of ordinary cement，which can effectively reduce the temperature stress of concrete and the risk of concrete cracking. The low heat Portland cement can be better used in the mass concrete of ship lock engineering to solve the problem of cracking.