Organic solar cell was considered one top promising light-harvesting technology in academia before organo-lead halide perovskite solar cell appeared. After the emergence of organo-lead halide perovskite solar cell, most researchers in the field of organic solar cells were attracted to move to the new research field, and most territories of organic solar cells were taken over by the new technology. Nevertheless, why still researchers are foreseeing a bright future of organic solar cell is that it has complementary strengths which the perovskite solar cell is hard to take. In this talk, strengths and challenges of organic solar cell will be dealt with in comparison to other solar cell technologies, especially organolead halide perovskite solar cell to find new opportunities for the second round.