To satisfy crack resistance of wharf surface concrete, the drying shrinkage of wharf surface concrete is studied by experiment. Experimental results show that when the water-cement ratio is constant, unit-volume water content for the wharf surface concrete shall be less than 165 kg/m3; when the water content is constant, concrete of larger water-cement ratio bears less drying shrinkage, and the water-cement ratio shall be controlled to 0.45~0.55; the unit-volume cement content for concrete shall be less than 360 kg/m3, and better limited to 300~360 kg/m3.