Sultam compound and application method thereof

A compound represented by formula I or a pharmaceutically acceptable salt thereof,

• wherein,
• X is CH2 or NR5;
• R1 is C3-6 cycloalkyl or 3- to 6-membered heterocycloalkyl containing 1 to 2 heteroatoms selected from the group consisting of N, O and S, which may be optionally substituted with one or more groups R6;
• R2 is phenyl or 5- to 6-membered heteroaryl containing 1 to 2 heteroatoms selected from the group consisting of N, O and S, which may be optionally substituted with one or more groups R7;
• R3 is phenyl, 5- to 6-membered heteroaryl containing 1 to 2 heteroatoms selected from the group consisting of N, O and S, phenyl CH2—, or 5- to 6-membered heteroaryl CH2— containing 1 to 2 heteroatoms selected from the group consisting of N, O and S, which may be optionally substituted with one or more groups R8;
• R4 is halogen, amino, hydroxyl, C1-3 haloalkyl or C1-6 alkyl;
• R5 is hydrogen or C1-6 alkyl;
• R6 is halogen, amino, hydroxyl, cyano, C1-3 haloalkyl, C1-6 alkyl or C3-6 cycloalkyl;
• R7 is halogen, amino, hydroxyl, cyano, C1-3 haloalkyl,
• C1-6 alkyl or C3-6 cycloalkyl;
• or R7 forms a O→N coordination linkage with N atom in R2;
• R8 is halogen, amino, hydroxyl, cyano, C1-3 haloalkyl, C1-6 alkyl, C3-6 cycloalkyl, C2-6 alkenyl or C2-6 alkynyl;
• R9 is H, C1-6 alkyl, C3-6 cycloalkyl, 3- to 6-membered heterocycloalkyl containing 1 to 2 heteroatoms selected from the group consisting of N, O and S, phenyl, or 5- to 6-membered heteroaryl containing 1 to 2 heteroatoms selected from the group consisting of N, O and S, which may be optionally substituted with one or more groups R10;
• R10 is halogen, amino, hydroxyl, cyano, C1-3 haloalkyl, C1-6 alkyl or C3-6 cycloalkyl;
• m is 0 or 1.