1.2.5-oxadiazol compound, alternative formula (1),N-these oxides and salts, and understanding their composition. In addition, 1.2.5-oxadizol compounds or compounds containing such compounds are used to control unwanted vegetation. In addition, methods of using these compounds. 1. Characteristic 1: 1,2,5-oxadiazol compound, its characteristic is formula (1),wherein R is selected from the group consisting of hydrogen, cyano, nitro, halogen, C₁₋₆ alkyl,C₃₋₇ cycloalkyl,C₃₋₇ cycloalkyl-C₁₋₄ alkyl,wherein the C₃₋₇ cycloalkyl groups in the two aforementioned radicals are unsubstituted or are partially or totally halogenated, C₁₋₆ haloalkyl,C₂₋₆ alkenyl,C₂₋₆ haloalkenyl,1. C 83228331 asphalt；C₂₋₆ haloalkynyl,C₁₋₄ alkoxy-C₁₋₄ alkyl,C₁₋₄-C₁₋₄-alkyl haloalkoxy,O-R74919,Z-S (O) -RZ-C (3DO) RZ-C (3DO) -ORZ-C (3DO) -NR RZ-NRᵍRʰ,Z-phenyl and Z-heterocyclyl, wherein the heterocyclyl is a saturated, partially unsaturated or 5 or 6-membered monocyclic or 8, 9 or 10-membered bicyclic heterocycle containing 1, 2, 3 or 4 heteroatoms as members of the ring, which are selected from the group consisting of O, N and S, wherein phenyl and heterocyclyl are unsubstituted or substituted with 1, 2, 3 or 4 group R, which are identical or different； CYC indicates a bicyclic or tricyclic radical of formulas (2) or (3) where # indicates the point of attachment of the bicyclic radical to the carbonyl group, Q, Q independently of each other indicates a fused carbocycle of 5, 6, 7, 8 ,A combined heterocycle of 9 or 10 members or 5, 6, 7, 8, 9 or 10 members. In this cycle, the combined heterocycle has 1, 2, 3 or 4 heteroatoms selected from O, s and N as ring members. In this cycle, the combined carbohydrate and the combined heterocycle are single or double ring. In this cycle, the combined carbohydrate and the combined heterocycle 1. 2, 3, 4, 5, 6, 7, 8, 9 or 10 radicals were not replaced.In formula (2), R1 is selected from the group consisting of Z1 Ciano, halogen, nitrogen and hydrocarbon c833318328a；
