Recently, CH3NH3PbX3 (X=Cl, Br, or I) based perovskite solar cells have attracted great attention due to the simple processing and high performance. In this work, we investigated the effect of using bathocuproine (BCP) in inverted perovskite solar cells. By using BCP, we tuned the work function of the Ag electrode from -4.23eV to -4.12eV, for improving the electron transportation and collection. We improved the power conversion efficiency of perovskite solar cells from 10.3% to 12.6%, with enhanced short circuit current density and fill factor. The stability of the perovskite solar cells was improved by ~10%. Our results demonstrated that, using BCP is an effective way to improve the performance of perovskite solar cells and to realize the commercialization of perovskite solar cells.