Water storage pitirrigation method is a new method suitable for orchard irrigation in gully area in the North China. Water infiltration is under varying-head condition. Considering the study lateral horizontal inf iltration of water storage pit

the experiments of infiltration in different heads were studied by horizontal column. The results are shown that infiltration head has significant effect on infiltrate coefficient

and has smaller effect on infiltration index

and the infiltration coefficients and inf iltration indexes both vary alternately between relative-stable and obvious variation as infiltration head increasing.The research result swill have an important value for studying further vary ing-head infiltration and soil moisture characteristic of water storage pitirrigation.