【Background】The study of insect color is significant not only in insect morphology, but also for its ecology and control management. The green color of insects is usually formed by the carotenoid and pigment porphyrin. 【Method】To explore the relationships between insect color and plant chlorophyll, the contents of chlorophyll and carotenoid of Arge geei Rohwer which were raised using cage in the field were tested. 【Result】The results showed that both 5th instar and 6th instars larvae had chlorophyll. The chlorophyll contents of 5th instar larvae were higher than 6th instar larvae. For fifth instars, the contents of chlorophyll a and chlorophyll b were 1.6780 mg·g-1 and 0.6847 mg·g-1 respectively, the content of carotenoids was 0.4797 mg·g-1; for sixth instars, the contents of chlorophyll a and chlorophyll b were 1.2726 mg·g-1 and 0.5187 mg·g-1, the content of carotenoids was 0.4863 mg·g-1. After removed the digestive system, the contents of chlorophyll a, chlorophyll b of fifth and sixth instars were respectively 0.4008 mg·g-1, 0.2618 mg·g-1 and 0.4299 mg·g-1, 0.3826 mg·g-1, the contents of carotenoids were 0.2444 mg·g-1 and 0.2859 mg·g-1. After treating with indoxacarb, the chlorophyll contents of sixth instar larvae with digestive system significantly declined. Chlorophyll a dropped by about 48%, chlorophyll b by about 34%, and carotenoids by about 37%. While the chlorophyll contents of sixth instar larvae without digestive system decreased slightly. 【Conclusion and significance】The larvae of A.geei contain chlorophyll and carotenoid, insecticides can reduce the contents of them. The color of A.geei and the chlorophyll have closely relationship.