In order to meet the requirements of the ground test control of gas generators, We analyze the control behavior, and puts forward an advanced object-oriented flexible control model (OOFCM) for ground test of gas generators, which accords with the developing direction of the measurement and test technology. Based on the OOFCM, a flexible control system (FCS) is realized, which can meet the requirements of the ground test control of all kinds of gas generators. The FCS has been used in the test successfully. Compared with the older test control system, the new system has higher dependability, simpler structure and more flexible manipulation.