The available phosphorus(AP)determined by the Olsen method was significantly affected by the extraction temperature，and the available P(Olsen-P)was extracted and determined with 0.5 mol/L NaHCO3(pH=8.5)at 25℃，which could not well reflect soil phosphorus availability at actual field temperature. Exploring the response of Olsen method’s AP to extraction temperature and establishing a quantitative relationship between the Olsen method’s AP with Olsen-P analyzed could provide a basis for evaluating the Olsen method’s AP at different temperatures in the field. The 24 black soil samples with a wide range of Olsen-P contents(4～280 mg/kg)were selected. And the AP was determined by the Olsen method at 10，15，20，25，30 and 35℃. The ratio and linear response coefficient of Olsen-P were analyzed. The correlation between Olsen-P and Olsen method’s AP at any temperature was converted by six conversion equations(direct coefficient substitution，indirect coefficient substitution，extraction rate fitting，least-square fitting，and two second-order fitting methods)to obtain any temperatures equation by verifying and comparing the conversion. The results showed that the Olsen method’s AP increased significantly with the increase in extraction temperature，and the increase of AP was 0.2～5.4 mg/kg for every 1℃ increase in extraction temperature. The Olsen-P in soil was positively correlated with the increment of the Olsen method’s AP. The amount of Olsen method’s AP and the relative extraction rate of Olsen-P affected by the Olsen-P was also positively correlated with the increase in temperature. And the average extraction rates at 10，15，20，30 and 35℃were 69.8%，76.1%，87.5%，113.7% and 138.7%，respectively. Based on the above，a two-factor conversion equation was established for the extraction of available phosphorus by Olsen method，extraction temperature，and Olsen-P content. The predicted value and measured value were compared according to the equation determination coefficient(R2)，root mean square of residual error(RMSE)and relative error(RE). The simpler conversion equation was chosen. The conversion equation [PT=(0.019×P25+0.170)×T+0.545×P25-3.247] with R2 of 0.996，RMSE of 6.18，and RE of 1.28(n=48)could be used for the conversion of Olsen method’s AP with Olsen-P at 10～35℃ in the range of 4～280 mg/kg soil Olsen-P.