Bulk-heterojunction organic solar cells (OSCs) have attracted great attention in recent years, because of their advantages of low cost fabrication, light weight and flexibility.The key issues in the studies of OSCs are the design and synthesis of high efficiency conjugated polymer donor and fullerene derivative acceptor photovoltaic materials[l].In this presentation, I will talk about our recent progress on two-dimension (2D)-conjugated polymer donor materials with conjugated side chains.