Abstract: The effect of different fertilization on the plant growth,fresh weight and the circumference of bulblets were studied by using an orthogonal design of N,P,Mg,K to explore fertilizer requirements,shorten growth cycle from tissue cultured seedlings to commercial bulbs and reduce production costs of lilies.The results showed that the optimal combination of N,P,Mg and K nutrition was N 80 mg/L,P 30 mg/L,Mg 24 mg/L,K 40 mg/L in early growth period(after transplantation for 3—10 weeks).In middle growth period (after transplantation for 11—22 weeks),a theoretically optimum fertilizer combination was N 200 mg/L,P 60 mg/L,Mg 48 mg/L,K 200 mg/L,but the best result of the test was N 200 mg/L,P 60 mg/L,Mg 96 mg/L,K 200 mg/L by using the fresh weight as the criterion.In late growth period(after transplantation for 23—34 weeks),the theoretically optimum combination was P 60 mg/L,K 400 mg/L,but the best result of the test was P 60 mg/L,K 200 mg/L.