The moisture absorption behavior of carbon fiber reinforced polymer for civil aircraft was investigated, and the resistivity of CFRP was detected simultaneously. The saturated absorbent samples were dealed with different electric current to obtain the relationship between desorption of moisture and electric current. The hygrothermal and electric-thermal effects on flexural properties were analyzed by bending test, crack orientation and flexural fracture morphology. Results indicate that the absorption rate of samples increases first and then followed by a stable trend. The resistivity variation with time is that it declines first and then shows a steady trend. The desorption rate of saturated absorbent samples grows with the increase of current, but the moisture content of the samples cannot reduce to zero. When the current of 2 A (ρ=33.4 mA/mm²)～4 A(ρ=66.8 mA/mm²)is applied to saturated absorbent specimens, the fracture performance is enhanced comparing with pure absorbent samples and the specimens do not separate into two parts, while the high current (5～6 A)makes the flexural performance decrease and it shows brittle fracture.