In order to study the filtration performance of the filtering and washing pool under micro-pressure (PFWMP) in different flow conditions, The physical model tests with flow rates of 5.4, 9.1, 12.4, 15.4 and 18.5 m3/h were carried out. The results showed that under different flow rates, that filtration situation of the PFWMP can be divided into three stages: the filter screen filter, filter cake filter and squeeze filter. The sediment removal rate of the PFWMP was about 66%. The grain size efficiency of sediment above 0.125 mm was 100%, which met the requirement of micro-irrigation or sprinkler irrigation for water quality. Its filtration time and interception of sediment weight of the situation under 5.4 m3/h flow was as 3.44 times and 2.32 times as the situation under 18.5 m3/h flow. Once the corresponding flow can be carried out to filter work time, filtration screen needed blowdown, otherwise easy damaged to the filter screen. Flow rate had little effect on sediment removal efficiency of the PFWMP. The smaller the flow, the longer the filtration time of the PFWMP, the more sediment can be intercepted by the filter screen, especially for the fine particles smaller than the aperture of the filter screen.