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A compressed air foam system (CAFS) was developed with a newly prepared multi-component foaming agents, and experimental study on pool fire extinguishing had been performed under different conditions, such as foam concentration, forepart structure of mixing chamber and working pressure. It is found that the foam concentration has a great impact on fire extinguishing efficiency, and an optimized concentration value exists. For instance, to diesel oil pool fires, this value is about 2.2%. In addition, the system with coaxial mixing chamber has a better efficiency than the one with T-shape mixing chamber. The effects of working pressure on fire extinguishments are also evident in experiments, the higher the working pressure, the easier the fire can be extinguished.