Effects of different irrigation amount on dry matter accumulation, plant height and yield under drip irriga-tion of soybean were studied in the paper. The results showed that the biomass and yield increased gradually withthe irrigation. The dry weight, plant height, yield of the fourth treatment was the highest among all treatments. Thehighest yield was 3 230 kg/ha. The suitable irrigation amount of soybean during the whole growing period was 380-450 mm.