The results from a nine years' field experiment on a calsic cinnamon soil indicated that the annual input of P 14.4kg/ha which is a little lower than the phosphorus harvested each year, had not only keeped higher crop yields but also maintained the soil total phosphorus pool and with a little increase of soil organic phosphorus in cultivated layer. In the treatment with nutrinents in 80% of harvested products recycled every year through a feeding-compesting cycle combined with phosphrous fertilizer applied, the crop yields and the soil organic phosphorus content both considerably increased after nine years. There was a significant decrease of soil total phosphorus from the plot receiving nitrogen but no phosphorus fertilizer, a large propotion of phosphorus provided to crops was from soil non-labile phosphorus pool, but only 12% of phosphorus from labile phosphorus pool when the soil is lack of phosphorus. Calculation indicated that about 90% of the P taken up by crops was from soil cultivated layer.