This study, the relationship between rainfall variability at 4 region (Northern, Northeast, Central and Southern) of data of Thai Meteorological Department with Niño3 and Niño3.4 for (DJF), (MAM), (JJA) and (SON) show in Table. It was found that, the most positive relationships between MAM season at over central with Niño 3.4 is 0.60082. Values estimated to be significant at 95% are bolded by Student’s t-test.