Abstract: In order to increase the resistant ability to unfavorable environment and the growth in seeding stage, develop the function of seed pelltization of choy sum, improve the application of seed pelltization, the right plant growth regulators used for seed pelltization of choy sum were screened. The effection of alphha-naphthylacetic acid, chlormequat, brassinolide, dynamic carbon 80, sodium nitrophenolate, indelebutyric acid, fulvic acid, the mixture of sodium nitrophenolate and indelebutyric acid to the germination percentage, root length, plant height, stem diameter of choy sum were tested in laboratory. The results showed that the root lengths of treatment with 0.01 mg/kg brassinolide and 2 500 mg/kg α-naphthaleneacetic acid were the longest and significantly longer than those of the control group on the 9 th and 15 th days after pelleting and coating, respectively; Treatment with 10 mg/kg brassinolide and 1 mg/kg sodium nitrophenolate had the highest plant heights on the 9 th and 15 th days after pelleting and coating, respectively, and were significantly higher than those of the control group; Treatment with 0.01 and 1 mg/kg brassinolide, both root length and plant height were significantly greater than those of the control group on day 9 after coating.Treatment with 250 mg/kg of α-naphthalene acetic acid and 5 mg/kg of chlorophyll had significant promoting effects on root length and plant height on the 9 th and 15 th day, respectively; Treatment with 10 mg/kg of sodium nitrophenolate and both 5 and 50 mg/kg of indole butyric acid had a significant thickening effect on the stem diameter of choy sum.