ABSTRACT The annual rainfall in Taipei has been recorded for 93 years. It is long enough to be used for statistic analysis. The author analyzed the charateristics of the Taipei annual rainfall based on the following analysis methods: (l) double mass curve, (2) the least square method, (3) moving average, (4) run test, (5) autocorrelation, and (6) the probability distribution model. Some conclusions have been drawn as the follows: 1.The Taipei annual rainfall for the latest 93 years is of stationarity. In other words, the recorded data has no man-made changes. 2.The Taipei annual rainfall can be recognized as a normal distribution at the 0.05 level of significance. Therefor the annual rainfall magnitude of any probability can be predicted based on the normal distribution model. 3.there is no significant circularity of any period of years. May be it results from the combination of too many circularities of any long period of time.
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