This study was conducted to provide basic data on controlling boring insect pests by identifying the damage and the occurrence ecology of beetles, which are boring insect pests that seriously damage Castanea crenata, an income tree of mountain farms. By location, the damage rate was 62.5% at the foot of mountain, 61.4% at the mountain range, and 61.3% at the mountain peak. By region, the damage rate was the highest in Hapcheon at 65.3%, followed by 62.5% at Hadong and 58.1% at Jinju. The total number of adult fables was 171, followed by 49.1% (84) for Moechotypa diphysis, 39.2% (67) for Batocera lineolata, and 11.7% (20) for Anoplophora malasiaca. As for the male and female ratio of imago, Moechotypa diphysis had 51.2% (43) female and 48.4% (41) male. The percentage of emergence of beetles, which are boring insect pests appearing in the specimen collected by the survey area, was 46.0% in Hapcheon, 32.9% in Hadong, and 21.1% in Jinju. As for the prevalence of beetles, Batocera lineolata appeared from June 22 which is the first day of the emergence period to August 30, and the amount of emergence by the prevalence period was 3.0% in June, 46.2% in July, and 47.8% in August. Anoplophora malasiaca appeared from May 20 to July 20, and the amount of emergence by prevalence period was 5.0% in May, 10.0% in June, and 75.0% in July. Moechotypa diphysis first appeared from August 10 to September 30, and the amount of emergence by prevalence period was 1.2% in July, 51.2% in August, and 46.4% in September. As for the number of eggs laid by beetles, Anoplophora malasiaca laid 90±6, Batocera lineolate laid 75±5, and Moechotypa diphysis laid 60±6.