中文摘要：

基于门槛面板模型，分别以农村信息化水平、农村资本投入和时间作为门槛变量，研究了信息化发展水平对农村经济增长的影响。研究结果显示，第一，从信息化水平看，信息化发展水平对农村经济增长的影响具有双门槛效应，不存在信息技术生产率悖论，但是呈现出信息化不同发展水平的异质性，随着信息化水平提高，其弹性系数依次下降；第二，以时间作为门槛变量，检验结果显示存在两个时间门槛，在2003年之前存在信息技术生产率悖论，随着时间的推移，信息化水平突破了门槛值，对农村经济增长的影响越来越大。第三，资本投入具有双门槛效应，资本投入的第一个阶段存在信息技术的生产率悖论，后两个阶段突破门槛后，信息化水平对农村经济增长影响是递增的，说明对农村资本投入的增加中，同时增加了对农村信息资本的投入，从而农村信息化水平得以提高，继而促进了农村经济的高速增长。

英文摘要：

This article researches into the influence of informalization on the rural economic growth, using rural informatization,rural capital investment and time as three threshold variables based on Threshold Panel Model. The research result shows：First, informalization level has double-threshold effect to rural economic growth and there is no productivity paradox in it, but the elastic coefficient declines in sequence. Second, the test which uses time as variable suggests that there exist two time thresholds. There was an information technology productivity paradox before the year of 2003, but with the time going on ,the informalization level broke through the threshold value and exerted more influence to the rural economic growth. Third, there existed an information technology productivity paradox in the first period of capital investment,but during the next two stages, the informalization shows ascending double-threshold effect to rural economic growth after breaking through the threshold, which means that the increase of rural capital investment brings about the increase of the investment of rural information capital, thus the informalization level is boosted, enhancing the rapid growth of rural economy.