The use of the color graph digitizing processing technology of the precipitation recording paper， is an effective exploration for rescuing the archives of climate history. The technology applying graph scanning and data processing, can scan pictures of precipitation recording paper, and can extract dropdown curve and convert precipitation recording papers into digitizing data of precipitation per minute, by the use of digitizing processing system of the precipitation recording paper.Then we can achieve a series of data set, including precipitation graph and precipitation curve, which based on minuteindex or hourindex .Finally we can get the standard file of precipitation intensity per minute or hour, so as to achieve the goals of saving data of precipitation autographic records wholly, actually and safely. The technology is the only way to change the current situation, and it makes full use of the implications of the information and reflects the value fully. By the use of the color graph digitizing technologic processing of the precipitation recording paper, and in the light of practical work experiences, we can analyze in detail the technologic problems during the course of digitizing processing and find their solutions.