Objectives:The author conducted a 1:50,000 field geological survey of the Yinmin breccia, which was drawn by the predecessors in the Dongchuan-Yimen area,and made a preliminary classification.Results:According to its genesis and age,it is divided into compound conglomerate,glacial conglomerate, slump breccia,detonation breccia and structural breccia.Conclusions:The research on the genesis and age of "Yinmin breccia",especially the proposal of "icicle conglomerate and compound conglomerate",is useful for solving the early and pre-Cambrian stratigraphic sequence,age,structural framework,The location of the geotectonic structure and the comparison of the stratigraphy in a large area,the exploration of the evolution of the Proterozoic geological history in Central Yunnan,the study of the paleoenvironment,and the guidance of ore prospecting are all important indicators.