Abstract: Experiments were carried out on the Mazhuang town of Taian from 2004 to 2006. To based the technique system that it finished by diagnosing crop nutrition and commending fertilization under winter wheat and summer maize rotational cultivation and ensure the best fertilization project, it tested the nitrate-N and yield and fertilization quantity of every quarterly crop under different fertilization .The results showed that different fertilization had significant influence on the yield of crop, Optimize fertilization increased 2.73%~6.39% on the yield of crop. No fertilizer reduced the yield significantly for the second and the third seasons, the extent of the reduction of output went to balance on the forth season; Long-term optimize fertilization make the nitrate-N of the soil at the same level in 0~60cm, but custom fertilization had improved the content of he nitrate-N, and subsoil was polluted latently; Long –term no fertilization made the he nitrate-N of the soil keep lower level; Optimize fertilization economized fertilizer 36.84%~52.97%. The optimize fertilization was the best in above three fertilization fashion.