Abstract: The ejector system is the key component of the chemical laser exhaust system. In order to improve the ejection efficiency of the exhaust system and meet requirements of miniaturization and economy, an ejection gas source scheme based on the gas generator to generate high temperature gas is proposed. A test stand of the ejection system composed of a gas generator based on structure of aero-engine mono-injector combustor and the two-stage supersonic ejector is established. An independent thermal test of the gas generator has been carried out and a docking test with the ejector has been successfully realized. Results show that ignition of the gas generator is reliable and the operation is stable; the ejector starts quickly and works smoothly under the action of high temperature gas injection, and performance indexes are better than design points:the ejector-gas temperature variation within a certain range does not affect the ejector performance. Research results expand the application of the gas generator, and at the same time, provide a powerful reference for the design and selection of ejector system solutions in this field.