Abstract: Through vacuum induction melting and pouring of K648 master alloy into plum blossom samples, the effects of different solution time and solution temperature on the microstructure of K648 super alloy were studied, and the microstructure evolution behavior of the material under different solution conditions was observed. The results show that prolonging the solution time can improve the effect of solution treatment to a certain extent, but it can not completely and effectively reduce the size and content of precipitates at the grain boundary. Properly increasing the solution temperature to1200-1220℃ is conducive to reduce the content of precipitates between dendrites and grain boundaries of K648 alloy, and realize the optimum ratio of needle shape α in the matrix phase dispersion strengthening and precipitated phase strengthening at grain boundary making the material have good comprehensive properties.