In response to the difficult problem of temperature cracks in the pouring of large volume concrete buildings in ship locks,this paper achieved crack control of the large volume concrete at Longxikou ship lock by optimizing the construction mix design,burying cooling water pipes,controlling the interlayer thickness and intermittent time of pouring,and maintaining the surface moisture.Meanwhile,sensors are used to collect concrete temperature data to evaluate the effectiveness of the crack control measures.In practical field applications,the temperature peak of concrete after pouring is between 32.1~41.4 ℃,and the internal surface temperature difference is between 9.6~16.4 ℃,both of which are far below the requirements of temperature control indicators without visible temperature cracks.The maximum 28-day dry shrinkage of C20 test blocks formed synchronously during pouring is 228×10-6 in the same curing period and 182×10-6 in standard curing room.This indicates that the crack resistance of large volume concrete has been greatly improved during the temperature drop stage of concrete.