Abstract： Hole conduction layer is one of the most important part in organic solar cells. In this study, we prepare a macromolecular composite film suitable for hole conduction in an organic solar cell using layer-by-layer (LbL) deposition technique and low conversion temperature process under ambient conditions. As opposed to previous processes, our method not only supplies a controllable layer thickness but also provides a better electric property. An UV-Vis spectrometer is used to verify our results. It shows that low temperature conversion process under ambient condition works just the same as traditional high temperature conversion process under vacuum conditions. Low-temperature conversion process causes fewer damages on the structure of the macromolecule and raises hole mobility from 10-6 cm2/Vs to around 10-5 cm2/Vs.