Phosphorus nutrient balances of the farmland soils in 50 varieties of crops and 5 types of rotation and its impact on soil available phosphorus nutrient content were studied in 43 sitespecific locations over three years in Shanghai suburb.The result indicated that:(1)the phoshorus nutrient surplus tendency of different crops farmland was:fewflower wildrice>fruits>vegetables>greensward>crops;The phosphorus nutrient surplus of different rotation farmland was:the rotation between vegetable and vegetable>the fruit tree only>the rotation between vegetable and crops> the greensward only>the rotation of crops and crops;(2)Content of soil available phosphorus after harvest gradually decreased with the depths of soil profile in the farmlands of different fields and different rotation fields.The higher soil available phosphorus contents were,the more phosphorus nutrient surplus would be in different planting patterns fields.(3)Phosphorus nutrient surpluses of the farmland soil in different crops fields and different planting patterns were significantly positive correlated with the content of available phosphorus content in the surface soil(0~30 cm)in harvesting.