Abstract: To clarify the risk of water eutrophication caused by phosphorus of cinnamon soil and phosphorus leaching character under the condition of rainfall in Shandong Province, the methods of continuous leaching and simulated rainwater were used to study P leaching character of cinnamon soil in Shandong Province. Results showed that the amount of water soluble P leaching increased with the increase of P levels; There was obvious difference of P leaching peaks among the different P treatments, leaching peaks of P7, P6 and other P treatments appeared respectively at 3d, 4d and 5d; There were significant positive correlations between Olsen-P and water soluble P or and and P leaching amounts; Olsen-P of cinnamon soil could migrate vertically with water and was migrated down soil profile about 15cm by annual rainwater; Olsen-P was thought as an important indication for P application. It was thought that Olsen-P contents of soils were kept about 20μg/g under the lower P supplies (<180kg/hm2), and this could meet the demand for high yield of crops for most crops production and did no harm to water substance. In conclusion, if the amount of P application is controlled less than 180kg/hm2, both of crop high-yield and good environment can be achieved.