Towards the end of Omavid Caliphate and beginning of Abbasid, secretaries and writers entered the Royal Court and with regard to their nationality and awareness of Persian ethics` tradition, transmitted this old and historically rooted heritage to Islamic world. In addition to using Persian ethical teachings in their correspondence, they compiled and translated many books affected by Pesian ethics. Their works then became one of ethical sources and next authors, relying on Quranic verses and traditions, tried to legalize them. In this way, Persian ethics turned one of Muslim scholars` sources in this field and affected their ethical system; now a question rises itself in the mind: which teachings and properties of Persian ethics transmitted to Islamic ethics? Trying to answer the question, the author has described five properties including king`s uniqueness, system of classes, following the king, justice and ethical different values. Persian ethics` transmission to Islamic world led to three approaches; some accepted it completely, some balanced it and some, paying attention to unity and everlasting state of reason, agreed with it along with other ethical systems and used some of its teachings.