Abstract: In order to investigate influence of thermal and force load to stress and deformation of shearer cutting unit case, thermal-structure coupling model for M G300 /700-WDK shearer cutting unit case was established, and thermal-structure coupling analysis was conducted based on temperature filed analysis. The analysis re sults indicated that the largest temperature value appeared around the high-speed level bearing bore and temperature difference between the upper wall and the lower wall was 7 °C. Compared with the statics analysis result for the cutting unit case, the largest stress and the largest deformation of the cutting unit case had respectively increased by 30. 3% and 93. 3% when considering thermal effect. Stress change at idler shaft bore and temperature of the cutting unit case were measured when loadi ng test conducted on the loading test bench for the cutting unit case, which indicated that numerical simulation analysis had a good consistency with test results.