The result analysis of the eigenvectors and principal component time series (PC's) of JJA in the first mode show that the relation or the variance of the eigenvectors is negative over the most region of Thailand but it is positive over at some area of southern region of Thailand, as shown in figure(a). Figure 3(b) shows the values of standardized (PC’s), which have positive and negative values. It was found that there was the most negative in 1954 found over the most region of Thailand there was high rainfall. On the contrary, there was the most positive in 1994 found over the most region of Thailand there was low rainfall.