Abstract: Bird-watching time is from late autumn to winter in East Dongting Lake. Meteorological factors affecting bird-watching include precipitation, wind speed, visibility, fog, snow cover, rime, wind and other weather phenomena. Based on the comparative analysis of historical data, this paper formulates the rules for determining the weather factors of bird-watching by using the factor weighting method, divides the index series of identifying factors of bird-watching weather into five value ranges, designs the weather indicators of bird-watching and the weather index of bird-watching, and defines the meaning of the weather index of birdwatching.