The purpose of this research is to examine levels of trust and factors affecting Bangkokian customer trust. A sample is a group of internet users whose age is 15 years old or older. They have had experience of on line purchasing either had experience searching information for online purchase. This study sdopted a survey questionaire method with a total of 400 internet users. The results of hypothesis testing showed that age, education level, frequency of using the internet, online shopping experiences, expense of purchasing (per time), categories of online shoppers, and brand name of product or service impact consumer's trust. In conclusion, this study found that the significant variable of online consumer's trust and online purchasing behavior is knowledge and relation-based trust. Therefore, online shopping website should create various communication channels in order to provide product/service information and solutions for customers.