Aiming at the cracking risk of super-long and super-thick mass concrete basement structure caused by thermal stress in tropical ocean environment with high salinity,high temperature and humidity,combined with engineering examples,the temperature field of mass concrete is simulated by Midas FEA finite element software,thus the temperature control measures of mass concrete are put forward and the risk of implementation and cracking are studied.With the method of setting cooling water pipes,there are no temperature cracks and seepage phenomena in the structure.This paper summarizes and refines the technical achievements of preventing temperature cracks in the construction of super-long and super-thick mass concrete in tropical marine environment,which can provide reference for the construction of basement projects with similar super-long structures.