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The main fan diffuser in a coal mine is an energy-recycling equipment with a dynamic energy loss for the main fan.Engineering practices and related researches show that the body structures of three types of diffusers are irrational.To solve the problem,an energy-saving diffuser is designed on the basis of the velocity potential theory.Under conditions of inlet velocity from 7 m/s to 32 m/s,7 condition experiments using the energy-saving diffuser of 2.31 AER (area-enlarging ratio) and 5 condition experiments using the energy-saving diffuser of 2.00 AER were conducted.Through a comparative analysis of the experiments,the results show that the COP (coefficient of performance) of the energy-saving diffuser of 2.31 AER is better than that of the energy-saving diffuser of 2.00 AER.