Abstract: From March to May,2004,we selected 8 typical parks or green lands in Shanghai downtown as the study sites to conduct a ornithological research. During this study,total 55 species of birds were recorded,which included 31 resident and 24 migratory species. With statistics methodology,we analyzed the avian communities with 10 major environmental factors covering the park area,water percentage,vegetation species,canopy cover,shrub cover,grass cover,hill number,location condition,human quantity,path width,the study results indicated that:(1) the following 7 environmental factors were important to impact the structures of the avian community,they were park area,vegetation species,shrub coverage,grass coverage,hill number,location condition of the parks and path width;(2) the avian community of theses urban parks tended to deteriorate in the bird number and diversity;the man-made lake which was currently promoted in the park designing and planning process would not be good to attract the birds.