The results from a nine-year field experiment on a carbonate cinnamon soil indicated that the continuous low-input of phosphorus fertilizer with 14.4 kg P/ha annually could slighty increase soil Olsen-P and labile-P to the level as "non-deficiency" of phosphorus but far from setting up a large available phosphorus pool. The application of phosphorus fertilizer combined with recycled phosphorus from pig manure every year seemed to be able to set up a large available phosphorus pool finally. The role of phosphorus in pig manure was similar to that of fertilizer phos-phorus in improving soil available phosphorus pool. However, the application of phos-phorus every year with low dose was much better in increasing soil Olsen-P,labile-P and Ca₂-P than the treatment with high dose once every six years.