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Gas generator is a key equipment of ejector system.The heat transfer performance of a long-time working gas generator with no cooling device is studied in this paper.The investigation results show that: (1) the materials heat sink is in dominating effect of heat emanating in the condition of no thermal protection,the temperature of the structure at the balance time is almost the same; (2) the subtraction between the max and min temperature will increase to the top at some time.Increasing the initiative temperature of gas generator,decreasing the wall thickness of gas generator,and using material with high thermal conductivity will decrease the max subtraction,changing the special heat makes no difference.