Comp Trading Company Limited was established in the 1985, and has become one of the leading ICT providers for hardware and software (ICT Solution) with multi brands for many leading companies in Thailand. The company has many technical specialists in each product for servicing our customers over 300 companies with high speed and efficiency. Under the current severe competition and changes in consumer behavior and lifestyle sales of the company has been decreased, which is contrast with the growth of the industry. Therefore company requires the analysis about many factors by both quantitative and qualitative research to capture understanding the consumer behavior changes and market situation. The factors that influence consumer decision makings are the Reliability of Provider Company, Expertise of staffs and Quality of products. To achieve the marketing objective, it variance effective strategies such as branding strategy for customer loyalty, marketing mix strategy in seven dimensions for boosting sales growth and customer relationship management strategy are developed and presented in the marketing plan in order to keep existing customers and inhcrease new customers.