Dock entrance foundation pit is usually by the water,and the uniform retaining structure like bored pile is often used in conventional engineering,which does not meet the special needs of subsequent dismantling and ship launching.In this paper,a compound retaining system of steel sheet pile and bored pile is proposed based on a rectangular foundation pit of a dock entrance in Shanghai soft deposit.The excavation is retained by steel sheet pile at riverside which is advantageous in construction and dismantling and bored pile at the other 3 sides which is stiff in retaining.The retaining structure,the waterproof curtain and the supporting system play a joint role in the construction process.The field construction shows that the deformation and force of the dock entrance foundation pit retained by a combination of steel sheet pile and bored pile are both effectively controlled,which verifies the feasibility of the compound retaining system in engineering application,and can provide reference for the design and construction of the dock entrance foundation pit.