Abstract: The paper aims to evaluate the security of Trifloxystrobin in rice and environment. The authors conducted a field experiment in 3 locations for 2 years to study the residues and degradation dynamics of Trifloxystrobin in rice and paddy field. For dissipation trial, Trifloxystrobin was applied at the dosage of 84.37 g a.i./hm2 on rice straw, and 562.5 g a.i./hm2 on soil or paddy water all for once; for final residue trial, Trifloxystrobin was applied at the dosage of 84.37 g a.i./hm2 and 56.25 g a.i./hm2 for 3 and 4 times, respectively; samples were took at harvest time. The results showed that: the degradation half-life of Trifloxystrobin in paddy water, soil and rice straw were 1.8-7.3 days, 2.4-9.7 days, 1.4-12.4 days, respectively; the maximum residue of Trifloxystrobin in soil, rice straw, rice shell and brown rice was 0.293, 4.435, 8.569, 0.901 mg/kg, respectively; the results revealed that the residue of Trifloxystrobin in brown rice was less than the MRL set by CAC (5.0 mg/kg).