Abstract: The phases of 14Cr-15Ni-6Si high silicon austenitic stainless steel in equilibrium state was obtained by thermodynamic simulation software. The effect of solid solution heat treatment temperature on the phase evolution of the high silicon stainless steel was investigated by OM and SEM. The results show that the equilibrium phases of 14Cr-15Ni-6Si high silicon stainless steel are mainly composed of γ phase, δ phase, G phase and M₆C carbide. When the solid solution temperature is higher than 1180 ℃, the alloy is mainly composed of γ phase and δ phase. With the solid solution temperature increasing, the content of δ phase increases gradually, which can reach more than 40%. When the solid solution temperature is lower than 1050 ℃, the mainly phases of alloy are γ phase and G phase. The existence of G phase and δ phase will significantly deteriorate the hot working performance of the stainless steel, leading to the appearance of hot working cracks.The best hot working process of 14Cr-15Ni-6Si high silicon stainless steel pipe is hot extrusion, and the optimal hot deformation temperature is 1050-1180 ℃.