This paper aims to study the important factors affecting the decision on bicycle usage in the short-distance trips. Questionnaire surveys of weight of various factors were carried out in the shared-use paths in seven communities in Bangkok. The related factors obtained from questionnaire surveys were grouped by using the Factor Analysis Method. Moreover Logistic Regression Analysis is used to develop the model to forecast the bicycle usage. The results show that there are three factors which influence the usage of bicycle: 1) traveling behavior factors which included travel cost, travel time, travel distance and monthly income; 2) the cycling promotion plans which included providing the privilege for cyclists, constructing the exclusive bikeway networks around Bangkok, preparing the related facilities for cyclists such as bathrooms and storage lockers, promote the use of cycling instead of using a private car.; and 3) legislation related to the bicycle usage influenced the decision of bicycle usage.