Abstract: In order to improve the structure uniformity and mechanical properties of GH2150A alloy, different solution heat treatments were performed on the alloy, and the effects of different solution heat treatment parameters on the microstructure and mechanical properties of the alloy were studied. The results show that with the increase of the solution temperature, the grain structure of the alloy and the size of the grain boundary carbides increase in turn, and the tensile properties decreases gradually. When the solution temperature are 1020-1040℃, the grain structure and grain boundary carbide of alloy are uniform and small, induced the alloy has high tensile properties. Compared with the properties after heat treatment at 1060-1100℃, the tensile strength and yield strength of the alloy are increased by about 20-50 MPa and 35-50MPa, respectively. After heat treatment at 1060-1100 ℃, the increase of the solution temperature causes the grain size of the alloy and the size of the grain boundary carbide to increase. The coarse carbide at the grain boundary promotes the intergranular fracture of the alloy, which leads to the decrease of the strength of the alloy.