Abstract: The precipitation concentration degree(PCD) and precipitation concentration period(PCP) in temporal and spatial distribution and regularity of each weather station in Altay region of Xinjiang were analyzed by using redefined concept of PCD and PCP based on precipitation data in May to September from 1961 to 2007 in 7 weather stations.The results showed that the PCD and PCP might express quantitatively the heterogencity of precipitation in space-time field.The average PCD in Altay region was 0.205;the average PCP was the 38.12 pentad.The average PCD in space was uniform,the PCD in east was higher than west;the average PCP was same in total.Altay and Fuhai stations were later than other stations a little.The period of PCD and PCP in Altay region and each station were given out by Morlet wavelet transformation,which showed big geographical difference in spatial distribution.By correlation analysis on precipitation anomaly,PCD and PCP,the result showed that the PCD and PCP was negative correlation with precipitation in most stations.The PCD in rainy years was less than that in low flow years,the PCP in rainy years was earlier than that in low flow years,but there were similarities and differences in spatial distribution.

Key words: Precipitation Concentration Degree(PCD), Precipitation Concentration Degree(PCD), Precipitation Concentration Period(PCP), Precipitation anomaly, Altay region