The invention relates to the field of medicines relevant to thrombotic diseases, in particular to a PAR (protease activated acceptor)-1 antagonist with an exocyclic imine structure containing benzo five-membered heterocycle, a preparation method of the PAR-1 antagonist, a medicine composition containing the PAR-1 antagonist and application of the PAR-1 antagonist to medicines for treating the thrombotic diseases. R1, R2 and R3 are independently selected from alkyl groups of C1, C2, C3, C4 and C5, and X is selected from O and C(CH3)2.