The importance of open approach to innovation and its role in firms’ growth and business development has been acknowledged today. There is no review paper in Persian to deal with literature about open innovation. In this respect, the paper tries to study basic concepts, research lines of the past literature and horizons ahead of open innovation which are useful for business managers, students and researchers of related disciplines. Along with the value chain from suppliers to users the open innovation literature has widened during the last decade. It has also considered different contextual factors such as industry type, firm size, organizational culture and structure, etc… This literature has also tried to develop required tools and deepen the process of open innovation from the view point of different units of analysis such as individuals, projects, firms, regional clusters and industries. Analyzing the gaps in this literature indicates that the alignment with business models, the effect of open innovation in the cases such as SMEs, service business, IP regimes, and the required tools, are among the most important research lines in this respect in the future.