Abstract:To solve the problems of opening blockage and high water-head loss in drip irrigation system,some kinds of open filters are developed,which have different cross sections,such as box type,cylindrical-type and prism-type.The results of hydraulic performance test show that water-head loss of cylindrical-type filter is the least(7.95 cm) when flow rate is 2 m3/h and that of box-type filter is the least(16.93 cm) when flow rate is 5 m3/h.Both meet the requirement of less than 30 cm water-head loss.The practice proves their excellent performance of good filter effects and lower water-head loss.