This study is to evaluate the areal precipitation from the basic data groups of monthly, seasonal, and annual rainfalls over all ma in stations in Korea. The evaluating pocesses are performed through the point and regional frequency analysis from the basic data. The basic data groups are divided into two periods-the first(1916-1944) and the second (1960-1979)-which are compared with each other. In the point frequecny analysis, the variable transformation method is applied to the best fitting distribution, and the normal fittings are established by using the Chisquare test method. In the regional frequency analysis, the geomorphologic factors and hydrometeorological factors are taken into consideration when dividing into five zones and Thiessen method and the Isohyetal method are applied. The results of this study are as follows: 1)The areal precipitation values of the first period are about 70-80mm less than that of the second period for the whole of Korea. Therefore, a new precipitation value of 1180mm is considered more suitable than the value of 1159mm, which has been up till now. 2)As the annual areal precipitiation values areevaluated over the five divide zones, it tis noticed that the difference between the values of the first period and the second is the largest in spring (to the extent of 5 times that in the other seasonas). Thereform it is considered that this result is necessary for the establishment of a timely insurance plan for the water resources. 3)The application of the Isohyetal method through the division of Korea into five zones is considered to be a reasonable procedure in the analysis of areal precipitation.