Enterprises divide the customers in the market into several customer groups according to a certain standard. Each customer group constitutes a sub-market. There are obvious differences in demand between different sub-markets. Market segmentation is the basic work for selecting the target market. Marketing activities in an enterprise include segmenting a market and taking it as the company's target market, designing the right product, service, price, promotion and distribution system "combination" to meet the needs and desires of customers in the segmented market.