Abstract: A filed experiment was conducted to compare the effect of controlledrelease fertilizer (CRF) on the growth of one year old Larix olgensis seedling with conventional urea at 0, 120, 240, and 360 kg/hm2 N rate. The results showed that both the height and firstorder lateral roots（L＞5 cm）were significantly enhanced when L. olgensis seedlings were applied with CRF as compared with common nitrogen fertilizer irrespective of rate. And at 360 kg/hm2 rate, the dry mass increased by 24.3 % applying the CRF in contrast to common urea. While no significant differences were found in either height to diameter ratio, or shoot to root mass ratio in the nitrogen types. At rates of both 120 kg/hm2 and 240 kg/hm2 nitrogen application, more nitrogen content was associated with the seedlings under CRF treatments, whereas the less ratio of leaf to total nitrogen content was found in the seedlings applied with CRF, indicating that at low and moderate CRF rates, seedlings absorbed more nitrogen and allocated more nitrogen to the stem and root. Combined results for seedling response to the urea source and their rates indicated that CRF was superior to conventional urea and the optimal rate was 240 kg/hm2 rate.