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Based a vertical ejecting device, the source item method and user defined function(UDF)technique were used to inject mass, momentum and energy of and propellant gas into chamber, get the jet flow field distribution on the surface of the propellant, the influence result from pressure and velocity is analyzed. The computation results show that this method can well predict ejection mechanism characteristics of inner flow field, and provide theory reference for the optimal design of the ejecting device and chamber.