The objective of this study was to estimate throughfall, stemflow, interception loss and net rainfall in relation to rainfall interception, and to understand the factors affecting interception process at Pinus taeda stand and Pinus densiflora stand in the Research Forests of Seoul National University, located in Choosan, Kwangyang, Chollanamdo. 1. The gross rainfall during the period of field observation was 3,107.6㎜(average 1,035.9㎜/year). Most of the daily rainfall intensity was under 30㎜, which was 90% in 1992, 81% in 1993 and 88% in 1994. 2. In this study the throughfall, stemflow, interception loss and net rainfall were expressed separately as a function of gross rainfall. The overall thraughfall collected during the period of field observation was 2,432.5㎜(78.3%) at Pinus taeda stand and 2,699.6㎜ at Pinus densiflora stand, out of total rainfall of 3107.6㎜. The canopy storage capacity, which was determined by the prediction equation between gross rainfall and throughfall was 1.1㎜ at Pinus taeda stand and 1.3㎜ at Pinus densiflora stand. 3. The sums of stemflow from measurement of total rainfall at Pinus taeda stand and Pinus densiflora stand was 227.3㎜(7.3%) and 62.7㎜(2.0%), respectively. The minimum rainfall causing stemflow was estimated as 7.2㎜ at Pinus taeda stand and 1.9㎜ at Pinus densiflora stand. 4. Interception loss accounted for 447.8㎜(14.4%) at Pinus taeda stand and 345.3㎜(11.1%) at Pinus densiflorra stand. 5. Net rainfall was 2,659.8㎜(85.6%) at Pinus taeda stand and 2,762.3㎜(88.9%) at Pinus densiflora stand. 6. The rates of throughfall and stemflow increased with increasing the gross rainfall. However, the amounts of throughfall and the stemflow were constant above 30㎜ at Pinus taeda stand and 50㎜ at Pinus densiflora stand. The rates of interception loss decreased with increasing the gross rainfall. However, the amount of interception loss was constant above 50㎜ at Pinus taeda stand and Pinus densiflora stand.