Based on sounding and surface observation data of 36 return-flow precipitation cases and precipitation data in Jinan and Qingdao during 2000 to 2013, this paper reveals circulation features, vertial characteristics of temperature and height thickness of return-flow precipitation in Shandong province in winter, and return-flow synoptic situations are typed by warm layer in the middle troposphere and cold layer in lower troposphere. The results show that return-flow situations can be divided into three types of return-flowⅠ, return-flowⅡand thin return-flow, respectively. Thin return-flow is composed of thin cold return-flow and thin warm return-flow warm. To pure snowfall, temperature thresholds in inland are T850≤-4℃, T925≤-2℃, T1000≤0℃ or Tground≤1℃. It is more important that surface temperature is less than 0℃ in coastal areas. Whether in coastal region or inland, rain turns to sleet or snow when temperature indexes show that T850≤-3℃, T925≤-1℃, T1000≤0℃ or Tground≤1℃. Thickness clues are various during the pure snowfall that H850-1000 is from 127 to 130 dagpm and H500-700 is from 252 to 256 dagpm in return-flowⅠand return-flowⅡ. In addition, H925-1000 shows from 61 to 64 dagpm and H500-850 shows from 403 to 413 dagpm in thin cold return-flow air while H700-1000 embodies from 279 to 284 dagpm and H500-700 embodies from 250 to 260 dagpm in thin warm return-flow. When rain turns to snow, H850-1000 marks from 127 to 130 dagpm and H500-700 marks from 252 to 256 dagpm. But phase converted cases of thin return-flow are too little, thinkness indicators need to focus on later.
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