BJ series single stage high speed centrifugal blower is a kind of the centrifugal type fan which adopts level 1 three-dimensional flow impeller to replace the multilevel impeller of the multilevel low speed centrifugal fan and utilizes the gearbox to achieve high rotation speed. The impeller adopts the design conception of the theory of three-dimensional flowing and applies liquidity analysis technology to predict the performance of the fan, making the polytropic efficiency of the single stage high speed fan reach 82% and the flow regulation scope wide to be applicable to various working conditions. With a compact structure of the fan, small volume, overall low noise, high degree of automation, it is widely applicable in industries such as waste water treatment, metallurgy, circulating fluid bed of power station, fluidized boiler, tail gas desulfurization, pharmacy, gas supercharging and so on.