A field experiment was conducted to study the effect of soil without nitrogen fertilizer on wheat yields in different towns of Jintan City.Also,soil fertility level was evaluated by five soil indicators,that was soil organic matter,nitrogen,alkali-soluble nitrogen,available phosphorus and available potassium.The results showed that,high-yielding fields without nitrogenous fertilizer produced wheat 3043 kg/hm2,middle and low-yielding fields produced wheat 2524 kg/hm2 and 2083 kg/hm2,respectively.IFI value, represented comprehensive soil fertility level,determined by the five soil indicators with membership functions and correlation analysis showed high,medium and low-yielding farmland was 83,69 and 54,respectively.The relationships between IFI value and wheat yields without nitrogen fertilizer were very significant after linear regression analysis.Thus,the soil indicators selected in our experiment could objectively reflect the actual soil fertility situation,and had far-reaching impacts on soil fertility evaluation and wheat scientific fertilization.