This paper studied the relationships among internal control quality (ICQ), corporate social responsibility (CSR) and financial performance (FP) based on samples from pharmaceutical manufacturing companies listed in Shanghai or Shenzhen stock exchange in 2013--2015. Study shows that ICQ has a positive impact to FP, in which CSR plays a mediation role and actively affects FP at the same time. Improving company's ICQ and fulfilling CSR should be complementary strategy. Pharmaceutical companies should strengthen its construction and fulfillm...