Relying on the Jiuweigang second-line shiplock engineering,the thermal,mechanical and deformation properties of early-age concrete were tested;on this basis,the temperature field,stress field and the cracking risk of sidewalls in lock chamber and lock head corridor were simulated,and compared with the actual monitoring data.The results show that the cracking risk of sidewall concrete in lock chamber and lock head corridor mainly comes from the temperature difference between the surface and the environment and between the inside and outside,and constraint from slab concrete.The cracking risk of surface concrete in chamber exceeds 1.0 in very early age,and cracking risk of center concrete exceeds 0.7 after 23.5 days;cracking risk of surface concrete in left side corridor is up to 0.79,and cracking risk of center concrete exceeds 0.7 after 17 days.The simulation results of temperature and cracking time agree with the monitoring results.