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Forest fire is one of the important disturbance factors in boreal forest ecosystem and also an important driving ecological factor of nutrient cycling in forest ecosystem. The variability of nutrients element after fire disturbance plays an important role in restoring the structure and function of forest ecosystem. To explore the soil phosphorus and potassium in northern coniferous forest ecosystems. In this study, we selected the typical forest type (Larxi gmelinii) in Daxing'an Mountains burned area that 3 years after moderate fire disturbance as research plots, and selected the nearby unburnt area as control plots, we investigated the effects of fire disturbance on the 0 - 10cm and > 10 ~20cm forest soil total phosphorus (TP) , total potassium (TK) , available phosphorus ( AP) , available potassium (AK) , and the main soil characteristics in this area. Our research results showed that the 0 - 10cm soil TP content significantly increased by approximately 56% and the 0 - 10cm TK content significantly increased by approximately 33 % after fire disturbance 3 years, compared to control plots. While the 0 - 10cm and > 10 -20cm soil available phosphorus content significantly lower than pre - fire level, the 0 - 10cm and > 10 - 20cm soil available potassium almost return to pre - fire level. The soil water content and pH were the main impact factors that regulating the change of 0 - 10cm soil available phosphorus and potassium in the early succession after fire disturbance. The results of this study will provide an important scientific basis for revealing the impact of fire disturbance on the dahurian larch forest ecosystem in Daxing'an Mountains, and have important guiding significance for the management of soil fertility and vegetation restoration after fire disturbance. [ABSTRACT FROM AUTHOR]