With the daily precipitation data of 40 meteorological stations surrounding the Taklimakan Desert from1961 to 2009 and four precipitation indices,the spatio-temporal variations of extremely weak precipitation in this area were analyzed in this paper.The Mann-Kendall method and Ftest were used to verify and calculate the trends and the changing rates of these indices in each station.Monte Carlo simulation was used to verify the regional significance of precipitation events and Copula function was used to det...