Abstract: In order to study insect resistance identification method of Chinese cabbage to Phyllotreta striolata (Fabricius), based on hazard classification standard of diamondback moth, Plutella xylostella (L.), the defoliation percentage of 48 Chinese cabbage [Brassica campestris L. ssp. chinensis (L.) Makino] varieties infected by the adults of P. striolata were estimated by natural evaluation method in the field. The results showed that the current hazard classification standard of diamondback moth was not applicable to adults of P. striolata. Further analysis demonstrated that the defoliation percentage of 48 Chinese cabbage varieties had significant positive correlation with the hole number (r = 0.354). These results suggested that quantity statistics of injured holes in cabbage leaves could be used to identify insect resistance of P. striolata. Moreover, in order to cultivate Chinese cabbage and its germplasm resources with insect resistance, 100 varieties of Chinese cabbage were used for identification of insect resistance to P. striolata. Five kinds of cabbage (‘Xin’aiqing-9’, ‘Xinxiachun No.3’, ‘918’, ‘Thailand seed-2’, ‘Xiaguan’) showed obvious resistance and another five kinds of cabbage (‘Chuqing 325-6’, ‘Qingyou’, ‘Jimaocai’, ‘12#bolting resistance Qinggeng × 668-1’, ‘Fuji’) were relatively susceptible. No significant difference was found among five resistant cabbage varieties on the numbers of leave holes, which were significantly lower than that of the five relatively susceptible varieties. These materials would be useful in future anti-insect breeding of Chinese cabbage.