Abstract: Based on the theory of planned behavior and the survey data of Beijing, the ordered logit model was used to demonstrate the influencing factors of the public’s willingness to adopt old and valuable trees. The research showed that the public’s attitude, subjective norm, perceived behavioral control on the protection of old and valuable trees and demographic characteristics such as age, work, relevance between work and resource protection, whether there are old and valuable trees near the residence had significant influence on the public’s willingness to pay in adoption and willingness to take pains in adoption. In order to improve the public’s willingness, it was suggested that the public’s joy of participation in protection should be enhanced firstly, and the support of people around should be strengthened, the difficulties in adoption should be overcame, the publicity of the benefits in adoption should be strengthened, the publicity channels about adoption should be increased, the publicity for specific groups should be carried out at the same time.