In order to effectively solve the shortcomings of the existing gas ejection source, as well as meet the needs of large mass flowrate and miniaturization of an injection system, a gas generator with multi-point injection structure using air and alcohol as propellants was developed based on the comprehensive analysis of various gas injection source schemes, and the experimental research under various working conditions was carried out. Research results show as bellows:the multi-point injection scheme greatly improves the space utilization rate, which effectively meets the miniaturization requirements of ejection system. Spray performance is good, and the spray cone angle and particle diameter are superior to the index requirements. Ignition reliability is high, which solves the shortcomings of low ignition reliability of the existing gas generator in the field. The operation curve indicates a rapid ignition, stable combustion and uniform temperature field of gas generator. The excess air coefficient range for stable operation is 2.52～4.34, showing a wide mass flow-rate range. In addition, efficient film cooling on the combustion liner inner wall effectively ensures the long time operation of the gas generator.