This study is going to infer and review the principles of ethical compatibility from Nahjolbalaghe viewpoint in a descriptive-analytical method. Compatibility is a necessary condition and for some necessary and sufficient condition to justify and validate the ethical approaches and holding compatibility inside the scopes of human being’s nature and also their interconnectivity is the  first criterion to assess their reasonability. Some of these principles has been argued in Nahjolbalaghe openly and some secondarily. Clarification and analysis of these principles in Nahjolbalaghe has two aspects: it shows authentication, justification and internal consistency in Imam’s approach, secondly it facilitate the way to instruct and educate human beings, because without analysis of men’s internal and external feelings’ compatibility it is difficult or impossible to recognize weak points and ethical diseases and paradoxical points and consequently the recommendation to remedy them suitably.