With consumers of Uni-President chain stores as subjects, the present study investigates the differences and relationship among corporate social responsibility, service quality, corporate image and purchase intentions, and with corporate image as an intervening variable, analyzes the influences of corporate social responsibility and service quality on purchase intentions to provide advices for chain stores’ business strategies. This study has conducted a questionnaire survey using the consumers in the northern, central and southern areas of Taiwan as subjects. Statistical analyses for this study have been conducted using the package software, SPSS12.0. The results of this study are summarized as follows:1.Corporate social responsibility has positive influences on service quality.2.Corporate social responsibility has positive influences on corporate image.3.Corporate social responsibility has positive influences on purchase intentions.4.Service quality has positive influences on corporate image.5.Service quality has positive influences on purchase intentions.6.Corporate image has positive influences on purchase intentions.7.Corporate image has a mediating effect that mediates the relationship between corporate social responsibility and purchase intentions.8.Corporate image has a mediating effect that mediates the relationship between service quality and purchase intentions.