Phosphorus loss on red soil orchard slopes(slope 25%) in Jiangxi province treated by seven different soil and water conservation treatments and a check(bare soil) was assessed.The results showed: (1) Phosphorus loss varied obviously in different treatments. Phosphorus loss is the most serious on bare soil (check), and planting Paspalum noatum grass on the whole orchard was the most effective method to prevent phosphorus loss. The phosphorus loss of bare soil was 3.4 and 8.5 times respectively more than the ones of the average of 7 different treatments and planting Bihia grass on the whole orchard. (2) Dissolved phosphorus (DP) was the major form of phosphorus loss in the test. Dissolved phosphorus (DP) and particulate phosphorus (PP) contributed respectively 77.5% and 24.5% of the total phosphorus loss. And DP was contributed 100% of the total Phosphorus loss in these treatments of planting Paspalum noatum grass on level bench terrace ridge, planting Paspalum noatum grass on the whole orchard and planting Paspalum noatum grass in strips on the orchard. (3) There exists obvious temporal distribution in soil phosphorus loss on orchard slope land of red soil. Serious phosphorus loss occurred in rainy seasons (in April, May,June,July). During this period phosphorus loss occupied 80.9% of total loss in a year. The correlation coefficients between phosphorus loss and rainfall of 7 different treatments were more than (0.91).