Abstract: Located at the junction of Songnen massif with Xingan massif, the Nenjiang-Heihe tectonic belt has long been the focus of geologist's attention. During the field work in Nenjiang area, the authors found a new suite of strata whose deformation and metamorphism are greatly different from those of surrounding geological bodies. Rocks exhibit such combinations as chlorite-muscovite tectonic schist, biotite-muscovite microlite schist and zoisite-muscovite mylonite schist. Geochronological research was conducted on chlorite-muscovite tectonic schist, which yielded a zircon U-Pb(LA-ICP-MS) age of 413.9Ma±2.7Ma. Based on the analysis of regional geological evolution history and geological characteristics of different ages, the authors hold that there is an tectonic mélange belt along Hongshanliang-Hadayang-Yikette area. This suite of strongly deformed rocks should be part of the tectonic melange belt, and the original rock was formed in the Early Devonian. The late structural location was related to the collage effect of Nenjiang-Heihe tectonic belt which occurred in late Early Carboniferous period.