AbstractOn the basis of previous studies and by means of field geological, remote sensing, petrographical, mineralogical, petrochemical and geochemical investigations, the authors studied the temporal‐spatial distribution of the regional structures, volcanic structures and products of volcanic activity in the coastal area of southeastern Zhejiang. On the basis and through a systematic comparison of the products of magmatism in the area, it is considered that there exists a compsite volcanic structural belt composed of linear and circular structures and it has been demonstrated that there exist volcanic intrusive complexes‐“trinity” composed of volcanic, subvolcanic and plutonic rocks. It is suggested that the volcanic intrusive complexes in the area belong to, the typical syntexis series and that its materials were derived from a mixed source of crust and