Abstract: By ¹⁵N-labeled trace trials，nitrogen utilization ratio of cucumher，tomato。cauliflower，chinese cabbage and kindy bean cultivated outdoor under the condition of norrnaI fertilization and different planting pattern，the distribution of nitrogen，and effects of supplying organic fertilizer in combination with inoraganic one are analyzed. The results show that the nitrogen utilization ratio，nitrogen residue in soil，and nitrogen losts of five vegetables are 28．63%，39．07% and 41．25%，respectively．Through supplying organic fertilizer in combinalion with inorganic one，the crop absorption of inorganic nitrogen decreases in the first year．but nitrogen residue in soil increases．