Some scholars criticized since emperor kangxi, hindered the development of science and technology is the qing government's rule. Kangxi rebuffed in line with international standards, will China's completely closed, China missed the best opportunity of development of capitalism. Qing dynasty kangxi period, however, science and technology invention has not really into productivity, then, compared with China, the missionaries spread advanced western science and technology at the time this so? Intellectuals such as qing dynasty Yang Guangxian criticism of western missionaries are completely useless and foolish? Scholars believe that the spread of the missionaries in the qing dynasty only is the key of opening China international science and technology, then the real plot is in China? Spread of religious teachings, or want to further realize the influence of Paris for Beijing, after all, Louis xiv of strongman is standing behind them? These missionaries figure seems to appear in the kangxi dynasty almost all the major political events. In authoritarian countries, everything to serve politics. Missionaries spread scientific civilization, under the appearance of a missionary, permeability is the essence of how to hide and performance? How do these affect the kangxi of the missionary policy? For behind the prohibition policy of the late, in addition to the cultural factors, kang xi has its political considerations? Against the south's secret qing dynasty organization and how the use of the doctrine of missionaries to challenge the qing court?