Compromise is of matters that it has plentiful applications in the people transactions and it is circulated more every day. But, legislator has not cleared and enacted article on it to now, for this reason, there were different views in various times, so that, it can't to see completely unique policy in lawyer views and judicial precedent.Jurisprudent ideas and jurisprudent sources has effective role played in the views dispersion, and sometimes, political and economical expediencies have not had ineffective to make that dispersed situation.In this investigation, tried to clear applicable rules on the compromise and its legal nature and also to present views about legal institutive nature. In this case, tried to bring the preliminary condition and to analyze its concept and nature and also views of the believed on cancellation and correctness of the preliminary condition and so to present a reason as credibility reason and correctness and necessity of the compromise jurisprudently and lawfully.At last, it is concluded that compromise is a mutual legal act in nature and it has contract matrix, it is unspecified, commutative and obligatory and also its subject is a legal positive act i.e. counter promise if any parties to compose a contract with determined terms and characteristics in future that its doing has been promised.