The effects of soil moisture content, dry mass accumulation and soil moisture content of capillary head, middle and tail of drip irrigation belt on crop yield under six different head pressures were investigated by laying 50m long drip irrigation belt. The results showed that the variation of average soil moisture content during the growth period was different due to the difference of drip irrigation zone type. The variation law of soil moisture content of N030 showed obvious trend of decreasing at first and then rising, and with the increase of dripper flow, the soil moisture content of N030 was increased. The change of soil moisture content was smooth in the whole growth period. The changing trend of L015 soil moisture content was smooth, and with the increase of dripper flow, the soil moisture content was changed more significantly in the whole growing period. Under the condition of L015, the soil moisture content in the whole growing period can meet the needs of crop growth, and it can provide sufficient water for crops. The lower the flow velocity and the longer the length were, the more the fertilizer was attached to the belt wall, the lower the fertilizer utilization efficiency of the tail crop was, and the less the nutrient absorption was, the lower the crop yield was. The yield uniformity of the head, middle and tail of capillary tube under different treatments was analyzed. It was found that with the increase of length of drip irrigation belt, the uniformity of crop yield of N030 was decreased gradually, and the uniformity of crop yield was increased at L015. Therefore, different drip discharges had certain effect on the yield uniformity along the length of drip irrigation belt.