Mechanical connection, as the main connection method at present, holes shall be made on the surfaces of connectors and connected parts, and the mechanical properties of the structural parts containing holes will be decreased to a certain extent. In order to study the tensile properties of carbon fiber reinforced polymer (CFRP) laminates with different width-to-diameter ratios under humid-heat environments, CFRP laminates containing center penetration holes with diameters of 1, 2, 3, 4, 5 mm, respectively, were prepared, and their damage morphology, stress-strain curves, and strength degradation were analyzed at 71 ℃ and 85% RH. The results show that the CFRP laminates in the room temperature dry (RTD) environment have a flat fracture with the basic characteristics of brittle fracture; the CFRP laminates in the elevated temperature wet (ETW) environment have the phenomena of interlayer delamination and fiber adhesion fracture, and delayed fracture occurs in the tensile process of the test pieces; the tensile strengths of the test pieces in the RTD and ETW environments decrease with the increase of the pore diameters. The tensile strength of the specimens in both RTD and ETW environments decreases with increasing pore size. In order to predict the tensile properties of porous laminates under humid and hot environments, a prediction formula based on the PSC criterion is proposed.