This paper studied the effects of temperature and salinity on incubation period of the red crab (Charybdis feratus) in the laboratory. Ovigerous females were reared in 100 L glass tanks at seven temperature (14, 21, 23, 25, 27,29, and 36 ℃) and five salinities (15,20,25,30,35) levels, resulte showed that the incubation period decreased exponentially from 28 to 10 days with increasing temperature in the range 21-29 ℃. Relationship between temperature (T) and egg incubation period (D) was analyzed using the following three equation models: power function, D=aT^b; Bělehrádek’s equation, D=a(T-a)^b; and from the Effective Accumulated Temperature, D=a/(T-a), the equation of heat summation theory was the best model to characterize the relationship between temperature and the number of days required for incubation. The biological zero temperature for development was 15.68 ℃ for the Effective Accumulated Temperature. The optimal incubation temperature was 27-29 ℃ while the optimal incubation salinity was 20-35. At low salinities, embryos must have developed more slowly, but later the enhanced water content of the eggs might have accelerated the hatching process. As the results express as curve regression, the best model of relationship between salinity (S) and egg incubation period (D) was D=0.53+200.24-0.14S+0.24S(R²=0.99，P<0.01).