This paper takes China's eight input-output tables from 2002 to 2018 as the research data, introduces the influence coefficient, sensitivity coefficient and corresponding weighted linkages to measure the national economic impact of the information industry, and empirically explores the development of the information industry. It also analyzes the skewness, kurtosis and change trend of weighted and unweighted industrial linkages. Finally, it compares the impact of competitive model and non competitive model on the measurement of information industry linkages.