Abstract: The methods of chemistry analyzes and fields experiment were applied to study the validity and utilization of phosphorus of sand soil．The result showed that the sequence of vivacity of phosphorus is：sand-loam > fine-sand> sand．And the plants use abio-phosphorus mainly in sand，while Ca-P is in great proportion．When phosphorus is fixed，the result of determining a bio-phosphorus form of soil shows that phosphorus is translated to Ca₂-P,Ca₈-P during a long time．Irrigation can activated phosphorus，and straw can increase the content of valid-phosphorus．The content of phosphorus of grains and plants increases together with increase of applied phosphorous in different treatments．The sequence of phosphorus utilization is：sand> fine-sand> sand-loam．The capacity of supplying phosphorus of high-fertility is better than that of low-fertility，and rate of phosphorous utilization is high．