With the development of river shipping,the number of locks gradually increased and the lock’s sizes are increased.The concrete crack becomes a prominent problem day by day.Prevention of concrete cracks and reinforcement corrosion is of vital importance to guarantee the service life of lock projects.This paper analyzes the cause of concrete crack of lock engineering,and control measures for concrete cracks are put forward from the control of raw material and mix proportion of concrete,temperature control,construction technology and constitution design.