On the basis ofdaily observation data and products ofnumerical forecast, two cold waveweather cases occurred inwinter of 2008-2009 in Ningxia region were discussed by using synoptic analysismethod and combining cold wave forecast index in winter of Ningxia, including the circulation background, the influence system, synoptic formation cause, ect. Themajor features and formation causes of two cold wavewere revealed, and some instructive information about cold wave forecast in winter in Ningxia region was obtained.