Abstract: Using the input-oriented super-efficiency DEA model based on constant returns to scale, this paper evaluates the operational efficiency of 30 major ITO listed companies. It is found that the overall operational efficiency of the listed ITO companies exhibits low level and there are significant differences in the various companies. In order to analyze how the factors such as firm size, staff quality and R&D investment affect operational efficiency, the paper employs Tobit model and the empirical results show that firm size, staff quality, government support and other factors have a positive impact on the operational efficiency while the impact of R&D investment is not significant.