On line services offer customers a splendid display of benefit such as enhanced control, ease of use and reduction transaction charges. In the last few years we have witnessed a substantial growth of Internet —based services, both from pure Internet businesses and from traditional companies that are developing online service. One of the key challenges of the internet as a service delivery channel is how they manage service quality, which holds a significant importance to customer satisfaction. the purpose of the research was to gain a better understanding of the service quality dimension that affect customer satisfaction in internet banking sector from a consumer perspective,  five service  quality dimension were selected to be tested in internet trading sector in order to explore the relationship between service quality and customer satisfaction.  The key to successful trading in the equity markets are not only attainable, they can also be learnt and taught. The successful investor exudes self-confidence, self-assurance and singleness of purpose. The research aimed to determine the service quality of Online Trading, to find the relative importance of the service quality dimension in online trading provided by trading companies with its customer satisfaction and customer perceptions of service quality. This survey was carried out in various places in Tamil Nadu by using questionnaire. A sample of 150 respondents has been chosen to collect the primary data.