In the process of syntactic analysis, the study found that dependency parsing mainly structurally analyzed simple sentences, and was less accurate in analysis of complex sentences. Therefore, we propose different method to solve the problems. First, analyze all the sentences by dependency parsing. Then, for simple sentences, we take the parsing result as features and create artificial rules to identify event-triggers in order to improve recognition accuracy and solve a phrase contains multiple sub-events. While, to complex sentences which contain multiple clauses, this paper use CRFs to identify trigger words