Abstract: The study from the single deposits to the metallogenic series and metallogenic system is an important progress in the study of metallogeny．In the course of probing into the theory of metallogenic series，their physical structure attracts attention．In this paper，the inner structures of metallogenic series are classified into 3 types：the material structure，the spatial structure and the temporal structure．The material structure comprises homologue，diversity，succession and complementarity between all kinds of ores and ore deposits．The spatial structure of metallogenic series includes paragenesis，zonation，transition，compactness and superposition between different kinds of ores an d ore deposits．The temporal structure comprises time-limit．stage asymptotics and paroxysm ． This paper gives some examples to explain the forming conditions of these structures，which have an reference effect to understand the metallogenic regularities and to guide the ore prospecting．