In the empirical analysis,we select the Changsha patent authorization and GDP statistics from 1990 to 2017,and use ADF test,Johenson cointegration test method OLS estimate test and Grainger causality test to study the relation?ship between patent output and regional economic growth in Changsha.Finally,the results of Grainger causality test show that economic growth is the cause of the growth of patent output in the late 1-4 years,but the growth of patent output is not the cause of economic growth.Hence,based on the data analysis result...