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Because particles of gas-solid two phase flow charge and random move,the electrostatic stochastical signal appears during conveying gas-solid two phase flow.The inserted electrostatic sensor may obtain the electrostatic stochastical signal of gas-solid two phase flow,and with FFT transform and the 3dB princple obtain cut-off frequency of electrostatic stochastical signal.With obtaining cut-off frequency and Spatial filter principle particles velocity is obtained.