The residual degradation dynamics of fenpropathrin in pea were studied by method of GC-ECD and field experiment.Meanwhile，the application technology experiment was researched.The result showed that，the original sediment of fenpropathrin was very different as the different application treatment in pea.The more fenpropathrin was applied，the higher original sediment seemed.The residual degradation dynamics of fenpropathrin in pea were followed first order kinetic equation.The degradation rates were identical basically in the different application rates，with the degradation coefficient of（∣k∣）=0.167 8±0.001 3，DT₅₀ ranged from 4.1 days to 4.2 days，and T₉₉ ranged from 27.1 days to 27.7 days.According to conventional useable method，pea was sprayed once or twice at 7 days intervals with 5.00 g·（667 m²）^-1 of effective composition of fenpropathrin，the last residues in pea products were all less than 0.5 mg·kg^-1 14 days after application，and all less than 0.1 mg·kg^-1 24 days after application.According to the MRL（foliage vegetable）of China and the MRL of Japan，the products accord with the quality safety requirements of both China and Japan.