This research covers the doctrine term and its implication for the topics of belief and its main pillars, it also deals with the history of term emergence and who first used it among first generation of scholars. The research is composed of three chapters: First chapter covers the meaning of doctrine in language and Islam, the second is for the description of belief and the knowledge degree required about it, and the third, the emergence of doctrine term and its implication for the topic it covers. This research concluded that this term became a scientific terminology covers a noble branch of knowledge distinguished by its evidences and topics, books were written about it, colleges and faculties were named after it, and it has its branches, topics, methodologies and specialized scholars