Abstract: In plastic greenhouses with vermiculite as substratum,robust annual branches were cut into 6 cm,9 cm,12 cm,15 cm respectively. Cutting work was done after cuttings had been soaked in 100 mg·L^-1 of ABT rooting powder for 1 hour. Analysis was made the survival rate. The results showed that the rooting rate of 12 cm cuttings was higher than other cuttings. The survival rate of 12 cm cuttings under the same conditions was 65%,and 9 cm and 15 cm cuttings were 45% and 44% respectively. The rooting rate of 6 cm cuttings was 31% and its rooting rate was low as compared with other cuttings. Therefore it could be found that there were significant differences in the their rooting ratio among different length of cuttings.