Abstract: Phosphorus（P） is hard to dissolve and be absorbed for plants.To improve the P efficiency and find the best P applying method, Larix olgensis sowed seedlings (1-0) were used to study the growth effect and Puptaking by seedlings affected by P amounts and fertigation ratios.The experiment conducted the splitspot design,with P amounts as main treatment and fertigation ratios as side treatment. The results showed that P concentration, P content,phosphorus using efficency was affected by phosphorus amounts significantly. The P concentration arrived the highest lever under the phosphorus amount 326 kg／hm2,but the phosphorus use efficency increased as the phosphorus deceased,and arrived the highest lever (43 ％)under the phosphorus amount 163 kg／hm2. At the same phosphorus amounts,fertigation ratios also had remarkable effect on P concentration, P content and phosphorus using efficency. Maximum of these indicators exhibited under 333 ％ fertigation ratio, for example the total P content and phosphorus use efficiency were 0079 g and 43 ％ respectively. The results showed that the best fertigation ratio was 333%. So a combination of two thirds of the phosphorus as basal fertilizer when transplanted, and one third as topdressing in August is the best phosphorus applying method for L. olgensis sowed seedlings.