Abstract: In order to study the effect of hydrothermal environment on the fatigue properties of carbon fiber fabric composite laminates, the tests of carbon fiber fabric on fatigue and residual compressive strength with the center-hole laminates were carried out. For the tests on tension-compression fatigue in hydrothermal environment, a chamber used for hydrothermal environment was designed. In accordance with ASTM standard, the fatigue test fixture and compression test fixture were designed and produced. Then the tension-compression fatigue tests of specimens were carried out in conditions of standard environment conditon (temperature of (23±2)℃, relative humidity of (50±5)% RH) and hydrothermal environment condition (temperature of (70±2)℃, relative humidity of (85±5)% RH). After that, the residual compressive strength tests were carried out, respectively. The residual compressive strength after fatigue in condition of standard environment was set as a reference value, compared with the ultimate compression strength corresponding to the failure load in condition of hydrothermal environment, calculating the difference between them. According to the comparison of test result, it shows that the residual compressive strength of specimens after fatigue in condition of hydrothermal environment decreases by 14%, so the hydrothermal environment has little effect on the residual compressive strength of carbon fiber fabric composite laminate specimens after fatigue under load spectrum.