Generally,concrete structures are under various stress state,but it is difficult to reflect the concrete structures durability in lab tests,which is often researched by the free-state concrete specimens.This paper probes into the influence of constant compressive load and flexural load on resisting chloride penetration in marine concrete by changing the load levels.The results show that both the chloride concentration among the pure bending section in concrete at a given depth and the chloride penetration depth in concretes increase with the increasing flexural load level.But the chloride concentration in concrete at a given depth and the chloride diffusion coefficient of concrete decrease first and then increase with the increasing compressive load.It can improve the anti-penetration of chloride for concrete when increasing compressive load at low level.Furthermore,there is a significant correlation between the flexural load levels and the constant load factor when expressed as an exponential function for typical high-performance concrete mix.The influences of flexural loads on chloride diffusion coefficient shall be considered in durability design of concrete structures.