Abstract: Effects of different chemical reagents on bulblet enlargement of lily were studied. The results showed that all the treatments by K, Ca, KT, brassinolide and Expansin could promote the enlargement of lily bulblets, but the NAA was harmful for growth of lily bulblets. The best result was the treatment with 500 mg/kg K, which could increase fresh weight of bulblets by 42.12% and was very significantly higher than the control.