1. In the existing 4-amino-6 - (4-phenyl substitution) - pic and its derivatives, as well as the acid of 6-amino-2 - (4-phenyl substitution) - pyridine-4-carboxyl and its derivatives, the components containing these acids and their derivatives, as well as the methods used as herbicides shall be provided. 1. Characteristic 1: a formula compound (1), wherein X is n or cy, and is hydrogen, halogen, and hydrocarbon c83318323；Halogenated tar c83218323；C₁₋₃ alkoxy,hello Coxi C₁₋₃,alquil C -tio o haloalquil C -tio R es ORh. R1 is h, lease c832131；R2 is halogen, lease land c832131；C₁₋₄ haloalkyl,C₂₋₄ alkenyl,haloalkenyl C₂₋₄,1. C 83228331 asphalt；haloalquinilo C₂₋₄,C₁₋₄ alkoxy,hello Coxi C₁₋₄,C₁₋₄-thio alkyl, C₁₋₄-thio haloalkyl, amino, C₁₋₄-alkyl alkyl, C₂₋₄-amino haloalkyl, formyl, (C₁₋₃ alkyl) carbonyl, (C₁₋₃ haloalkyl) carbonyl, cyano or a group of the formula -CR¹⁷ = CR¹⁸-SiR¹⁹R²⁰R²¹,wherein R¹⁷ is hydrogen, F or Cl； R¹⁸ is hydrogen, F, Cl, C₁₋₄ alkyl or C₁₋₄ haloalkyl；R8313,R²⁰ and R²¹ are, independently, C₁₋₁₀ alkyl,C₃₋₆ cycloalkyl,a. Halogenated tar c83218d318321； 8320；Halogenated ring 12phenyl, substituted phenyl, C₁₋₁₀ alkoxy,or OH； R³ and R⁴ are each, independently, hydrogen, C₁₋₆ alkyl,C₁₋₆ haloalkyl,C₃₋₆ alkenyl,haloalkenyl C₃₋₆,1. C 83238331 asphalt；hydroxy, C₁₋₆ alkoxy,hello Coxi C₁₋₆,a. Two two two two two two three three three three three three three three three three three three three three three three three three three three three three three three two two two two two two two two two two three three three three three r83088 and the nitrogen atoms connected with it form a saturated or unsaturated 5 or unsaturated ring Six members, namely R3 and r83088, add up to = CR * r83088；where R³ and R⁴ are each, independently, hydrogen, C₁₋₆ alkyl,C₃₋₆ alkenyl,1. C 83238331 asphalt；C₁₋₆ alkoxy or C₁₋₆-amino alkyl, or R³ and R⁴ together with the carbon atom to which they are attached form a saturated ring of 5 or 6 members； Ar is selected from the group consisting of
