By standards testing (the sample standardization and the measure standardization), the standard IR spectras of the china famous teas were obtained. In order to investigate the overall characteristics of tea producing area, a visual, simple method (average deviation) on the IR spectra to analyze the relation between the average deviation and the latitude of several typical standard teas is devised. The result shows that: the average deviation of the tea with similar latitude and altitude is very small; On the contrary, the average deviation is considerable. There are affinities between the altitude and latitude of the tea producing areas and the average deviation of their IR spectrum, the average deviation is possible to be a using method to analyze the information of the tea producing area.