Typical imperative sentence is used, by a certain person and at a certain time, to ask a certain person to execute an action. Concurrently, there are also untypical imperative sentences. This paper focuses on idioms with imperative form, which has untypical imperative features in terms of its grammar and meaning. The conclusion is as follows. Morphological features: Plain verbal imperative form, like [shiro], [suruna], is typical for idioms. In addition, ancient Japanese imperative form [seyo], [suna] and [suru-koto-nakare] can also be seen in idioms. Syntactic features: Most of the idioms with imperative form have thematic structures [N wa V-shiro],which usually contains a topic. Others like the sentence with conditional mood [C (nara/ba/temo) V-shiro] are also commonly seen. Semantic features: Unlike typical imperative form, idioms do not have a certain person that takes the action, and do not have a certain time to carry out his actions. Idioms mainly speak of what people should do or give suggestions regarding better ways to handle things. Other features: Some idioms contain non-volitional verb or passive imperative form like [Ato wa no to nare yama to nare](Only focus the front but miss the rear)and [Nagai mono niwa makareto](Wise man submits to circumstances) which are rarely seen in typical imperative.