Taking Yanfeng 47 as material,the effects of different phosphorus application rates on growth traits,drymatter accumulation and yield of rice were studied in the Xinjian base with relatively low available P content andXi’an farm with relatively high available P content by plot contrast test method,in order to determine the optimalphosphorus application rate in different plots with relatively low available P content and improve P fertilizer produc-tivity.The results showed that in a certain range,increasing P fertilizer was beneficial to increase tiller number andensure enough panicle number per unit area of rice.Appropriate increase of P fertilizer can improve the net photo-synthetic rate,enhance the photosynthetic capacity of rice,synthesize more photosynthetic products,and promotethe high yield of rice.Appropriate increase of P fertilizer increased dry matter accumulation,percentage of dry mat-ter accumulation to grain yield after full panicle,spikelet and grain number per panicle,but when it increased to acertain extent,the promoting effect was transformed into hindrance and reduced rice yield.According to the experi-mental data of the newly built base,the function equation of the effect of P fertilizer amount （X） on rice yield （Y） wasobtained:Y=-0.052X²+12.563X+8 967.9.Combined with the local rice production practice,the suitable applicationamount of phosphate fertilizer （P₂O₅） in the newly built base with relatively low available phosphorus content was 105.00-120.80 kg/ha.According to the experimental data of Xi’an farm,the function equation of the effect of phos-phate fertilizer amount （X） on rice yield （Y） was obtained as follows:Y=-0.094 4X²+21.045X+10 319.Consideringthe local rice production practice,the suitable application amount of phosphate fertilizer （P₂O₅） in Xi’an farm withrelatively high available phosphorus content was 78.75-111.47 kg/ha.