Alkylamino-substituted dicyanopyridine compounds (I) and their salts, N-oxides, solvates, salts of N-oxide or solvates of N-oxide and salts are new. Alkylamino-substituted dicyanopyridine compounds of formula (I) and their salts, N-oxides, solvates, salts of N-oxide or solvates of N-oxide and salts are new. Either R 1>； : H or (1-4C)-alkyl； and R 2>； : (1-6C)-alkyl, (2-4C)-alkenyl, (2-4C)-alkynyl or (3-7C)-cycloalkyl, where: (1-6C)-alkyl is optionally substituted by 1-3 F, Cl, CF 3, CF 3O, (1-4C)-alkoxy, (3-7C)-cycloalkyl, (3-7C)-cycloalkoxy, (1-4C)-alkylsulfanyl or (1-4C)-alkylsulfonyl, (2-4C)-alkenyl and (2-4C)-alkynyl is optionally substituted by 1 or 2 F, CF 3, (1-4C)-alkyl, CF 3O or (1-4C)-alkoxy, and (3-7C)-cycloalkyl is optionally substituted by 1 or 2 F, Cl, CF 3, (1-4C)-alkyl, CF 3O or (1-4C)-alkoxy； or R 1>；R 2>；N : 4-7-membered heterocycle optionally substituted by 1 or 2 F, Cl, oxo, CF 3, (1-4C)-alkyl, CF 3O or (1-4C)-alkoxy； R 3>； : H, -C(=O)-C(R 4>；)(R 5>；)-N(R 7>；)(R 6>；) (A), -C(=O)-C(R 8>；)(R 9>；)-N(R 10>；)-C(=O)-C(R 11>；)(R 12>；)-N(R 13>；)(R 14>；) (B), -C(=O)-C(R 8>；)(R 9>；)-N(R 10>；)-C(=O)-L 1>；-N(R 15>；)(R 16>；) (C), -C(=O)-L 2>；-N(R 16>；)(R 17>；) (D), -C(=O)-L 2>；-N(R 19>；)-C(=O)-C(R 11>；)(R 12>；)-N(R 13>；)(R 13>；) (E) or -C(=O)-L 2>；-N(R 19>；)-C(=O) -L 1>；-N(R 15>；)(R 16>；) (F)； L 1>；, L 2>； : (2-6C)-alkanediyl； either R 4>；, R 8>； : H or the side group of a natural amino acid or its homologous or isomer； and R 6>；, R 7>；, R 13>；-R 18>； : H or (1-4C)-alkyl； or R 6>；R 7>；N, R 13>；R 14>；N, R 15>；R 16>；N, R 17>；R 18>；N : a 5- or 6-membered heterocycle optionally substituted by 1 or 2 (1-4C)-alkyl, amino, OH or (1-4C)-alkoxy； or R 7>；R 4>； : pyrrolidine- or piperidine ring； R 5>；, R 9>；, R 10>；, R 12>；, R 19>； : H or CH 3； and either R 11>； : H or a side group of a natural alpha -amino acid or its homologous or isomer； or R 14>；
