Abstract: From the perspective of comitative category, modern Chinese lexical class has been divided in two parts: event words and non-event words. Event words are the essential parts of comitative category which include verbs, adjectives, negative adverb, some numerals, the nouns functioning as verbs. When many events happen or develop at the same time, it means they have comitative relations. When analyzing, we need firstly to find all the events out, and the related persons or things. Then it's necessary to draw time axis for the events to see whether they have overlapping time. Last, it is imperative to find the main events and the comitative events in the set of the overlapping time events.