This paper attempts to parameterize the miter gate lock head with gradient corridor in the flow direction and optimize the design.The compound shape method optimization algorithm is used and size controlling parameters are selected as design variables.The minimum volume of concrete is selected as the optimization objective function and constraint conditions are anti-sliding,anti-floating,and anti-overturning.The optimized concrete volume decreased 7.109% in comparison with the initial proposed body type and better results are gotten.Reference is provided for future engineering design.