Abstract: In order to provide scientific basis for pest prevention, the biological features of growth, development and feeding of jujube Porthesia similis were investigated in this study. The jujube Porthesia similis larvae were fed with three kinds of leaves including Euonymus maackii leaves, jujube leaves and cabbage leaves, respectively, under natural condition in Yanan from June to August. The growth characteristics of body weight, body length, ecdysis, cocooning and eclosion were observed. One Way ANOVA and multiple comparison methods were used to deal with the data. The results showed that the body weight and body length of jujube Porthesia similis larvae increased with the increase of ecdysis time, including 6 times of ecdysis divided into 7 instars. The ecdysis times, body weight and body length of jujube Porthesia similis larvae fed with cabbage leaves were significantly different from that of the other two treatments. The body weight and the body length of the cabbage leave feeding group reached 6862.6 μg and 1.71 cm, while they were 2004 μg and 0.9 cm of the jujube leave feeding group. The cocooning rate, eclosion rate and survival rate of the euonymus maackii leave feeding group were significantly higher than that of the other two treatment groups. The cocooning rate and the eclosion rate were 30% and 10%, respectively. The survival rate of the jujube leave feeding group was the minimal. The results had references for the forecast and prevention of jujube Porthesia similis.