A 2 day’、continuous severe thunderstorm occurred in most areas of Ningxia on June 14th and 15th, 2004, part of the ye110W  RlVer  1TTlgatlOn TeglOn haS heen StrLICl} by hall.  By LISlng the TOlltlne meteOTOlOg1Ca1 data and dOppleT radar pT0(1LICtS and  SO On,a meteorological analysis of this process has been done, the analysis shows that: this is a typical continuous severe thunderstorm pro-CCSS In  N1ngXla Wh1Ch TCSlllted fTOm the TOtatlOnal eaStWa.T(1S and  SOLIthWa.T(1S  MOngOha Cold  VOrteX.  Frnm  the radar eC110  dlffeTenCe  he-tWCen  general  thLIndeTStOTm  and  SCVCTe  thLIndeTStOTm  Wlth  hall,  the  mOnltOTlng  and  fOTCCa.Stlng  1ndeX  Of  N1ngXla  SCVCTe  COriVCCtlOn
weather has been gained with statistics. By using the forecasting products of Ningxia meso一、tale model MMS, a simulative analysis
has been done on it's related physical quantities, which has gained a valuable results.

By using a total of 49 years（1955~2003）duststorm data from 13 representative sites in Ningxia，We established a intensity standard of regional dust storm in Ningxia，divided extremely strong，strong，andordinary dust storm after 1955，and studied the time and intensity evolving features of Ningxia dust storm.By the analyse of temporal-spatial distribution features of sand stormsc ontrast to Gansu province，Some scientific basis of sand storm monitoring，warning，forecasting and preventing were provided for the east of Northwest China.