The influences of solid solution time on mechanical properties, fracture morphology and fracture toughness of 7050 aerial aluminum alloy forgings were studied by differential scanning calorimetry (DSC), tensile at room temperature, fracture mechanics experiment, scanning electron microscopy(SEM) and energy spectrum analysis. The results show that when the solid solution time is less than 90 min, with the increase of solid solution time, the second phase particles in the alloy dissolve into the matrix gradually, and the remaining coarse second phase particles are mainly Al2CuMg and Al7Cu2Fe phases. When the solid solution time is 90 min, the tensile strength，yield strength and fracture toughness of 7050 aluminum alloy forgings reach the maximum value of 530 MPa, 490 MPa and 37.7 MPa·m1/2，respectively, and the fracture mode of 7050 aluminum alloy is mainly the slipseparation fracture in ductile fracture. When the solid solution time is between 30-90 min, with the increase of solid solution time, the size，number and depth of the dimple increase. However, if the solid solution time increases continuously, the number and depth of dimples decrease gradually. Thus, the optimal solid solution treatment for 7050 aerial aluminum alloy forging is 475 ℃×90 min.