This study was performed in order to grasp the developmental characteristics in cone and seed of Pinus densiflora stands, which is distributed on a slope in the south and the north of Mt. Acha. Comparing the size in cone after September that the maturity in cone is completed with the average size in 2006 and 2007, the southfacing slope was 32.6 mm in length and 17.8 mm in width. The north-facing slope was 31.2 mm in length and 18.5 mm in width. Thus, difference wasn't big. However, the period of reaching the average size(29.8mm) of north-facing slope in 2007 was June 26 in the south-facing slope, and September 19 in north-facing slope. Thus, south-facing slope was surveyed to be faster by over 2 and half months. The water content after September was higher in cone of the north-facing slope. Even the period of being required that the ovuliferous scale in cone is opened was surveyed to be longer in the north-facing slope. In the meantime, comparing the average size in seed after September with length, the south-facing slope was 4.06 mm. The north-facing slope was 4.08 mm. Thus, it was surveyed to be mutually similar. In case of the south-facing slope, the period of reaching this average size (4.06 mm) was July 3. On the other hand, the north-facing slope was surveyed to be August 6. Thus, the south-facing slope could be known to reach this size faster by about 1 month. As for the seed number per cone, the north-facing slope was a little larger with 16.9 compared to the south-facing slope with 14.8. Even the rate of filled seed was indicated to be 56.2% and 60.0%, respectively, for the south-facing slope and the north-facing slope. Thus, the north-facing slope was shown to be higher. As for the germination percent in the filled seed, the south-facing slope was 88.6%, thereby having been surveyed to be higher than the north-facing slope with 80.8%.