Abstract: The application of transgenic insect- resistant crops has been an important way to replace insecticides. But transgenic insect-resistant crops have potential negative effects, especially the effect on the non-target organisms and resistance to GM. Visual assessment and yellow traps were used for investigating the dynamic of leafhoppers and main arthropods in Cry1Ac transgenic insect-resistant corn field for two years. The study showed that planthoppers and leafhoppers were highly abundant and diverse in maize fields, their midterm occurrence was 28.9%-43.1% of sucking pest insects, and the population dynamic had no significant difference between Bt-maize and the untreated near-isogenic maize. Leafhoppers were directly exposed to these entomotoxic proteins and could also serve as a source of Cry protein exposure to predatory arthropods. Therefore, it was reasonable to use Auchenorrhyncha in the risk assessment of GM corn. So the risk of Bt corn on non-target organisms could be evaluated using leafhoppers as an indicator species. The results in field tests showed that this method was feasible.