Abstract: Based on the daily surface air temperature data of 17 stations in Shijiazhuang during 1955 and 2007,the climate and synoptic characteristics of persistent high temperature was analyzed.Circulation features and formation mechanism of three persistently strong high temperature cases were analyzed in detail.The results showed that persistent high temperature continuity and strong high temperature events increased from 1990's,while the persistent strong high temperature mostly occurred from second ten days of June to first ten days of July.The Continental warm high pressure and meso-scale high pressure system in Hetao with downdrafts brought about strong warm air masses developed and maintained,and lead to persistent high temperature in Shijiazhuang.The foehn effect in the east foot of the Taihang Moutain strengthened the high temperature as well.

Key words: Continuing high temperature, Continuing high temperature, Climate characteristic, Continental warm high pressure