Analyzed the impact factor of the self-cleaning screen filter's drainage flow, found that the filter drainage flow Qp is determined by the flow coefficientμ. In order to investigate the drainage flow coefficient variation, mainly conducted the sand suction opening size's impact on the flow coefficient of the self-cleaning screen filter drainage system, found that the flow coefficient increases with the sand suction relative inflow area's increase, but when the relative inflow area increases to a certain extent, the flow coefficient doesn’t change and tends to a constant. Established the drainage flow coefficient formula, analyzed the drainage flow coefficient formula and found that: when bl/A2>0.15,that is when the sand suction entrance length l>500mm(The sand suction entrance width b=300mm ,is a constant ),the sand suction opening area has less than 0.5% impact on drainage flow, the drainage coefficient hardly changes with the sand suction opening area’s increase, this variation is con-sistent with the test analysis results. According to the drainage flow coefficient for-mula, established the self-cleaning screen filter drainage flow calculation formula, conducted the mean square deviation ERMS inspection of the formula, obtained ERMS=0.00174,showed that the formula has a high fitness.
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