In this paper, the lavas of three Holocene volcanoes in Tengchong volcanic field, Heikongshan volcano, Ma’anshan volcano and Dayingshan volcano, were studied in detail, including the compositions of bulk rocks and phenocrysts, texture features and crystal size distribution (CSD) of phenocrysts. The result shows that the lavas in Heikongshan, Ma’anshan and Dayingshan volcanoes are mainly trachyandesite, and the compositions of phenocrysts in trachyandesite are similar. The analysis aforementioned shows that there are at least two magma chambers in the horizontal and vertical directions respectively under Tengchong volcanic field.