Many studies have shown that climate change influence the distribution of terrestrial animals, especially for those that live in areas of high latitude or altitude. This project tried to find a way in monitoring the impact of global warming on altitudinal migration of alpine bird species. We conducted transect survey and acoustic monitoring along trails from 1800 m to 3800 m above sea level to collect altitudinal distribution data of apline bird species in breeding and non-breeding seasons. ROC curves and paired t tests were applied to compare altitudinal distributions of breeding season with that from each month in non-breeding season for each alpine bird species. We found that altitudinal distribution of some species like Collared Bush-Robin (Tarsiger johnstoniae) and Taiwan Rosefinch (Carpodacus formosanus) descended along mountain slope clearly in November and December. However, some other species like Taiwan Fulvetta (Fulvetta formosana) and White-browed Bush-Robin (Tarsiger indicus) showed very similar altitudinal distribution between the breeding and non-breeding seasons. ROC curve was sensitive to illustrate the change in altitudinal distribution of alpine birds and with great potential to monitoring the impact of climate change on altitudinal migration of apline birds. We suggest conducting regular surveys at an interval of 5-10 years and make comparison with this year's baseline data.