The effects of three hydrophobic agents on the mechanics and durability of concrete were studied.The test results show that the hydrophobic agents Caltie,ZBH and KLJ-Ⅵ all have certain air entrainment and retarding characteristics,which can promote the development of concrete strength and reduce the water absorption rate of concrete,and KLJ-Ⅵ can also reduce the chloride ion diffusion coefficient of concrete for 28 days,inhibit the transport of harmful ions,improve the durability of concrete,and have better comprehensive performance.