Finns create competitive advantage by perceiving or discovering new and better ways to compete in an industry to bring new products and services to market. So firms should have a clear understanding of the importance of innovation. It involves changing competences and capabilities and producing qualitatively new performance Outcomes. This research studies on relationship between firm size and innovation Success in the chemistry industry. The survey is implemented to 52 firms and data are analyzed by SPSS programme. In the part of the methodolgy, dependence of innovation success to number of employees is explored and then effects of the number of employees Oil the innovation Success are tested. This research draws a conclusion if the number of employees increases, innovation success of firms will increase.