The Objectives of this research aim to study about demographic factors which influence customers’ behaviors for online products and to study about the importance of marketing mix factors of customers. This research also study about the relationship between marketing mix factors and customers’ buying decision for online products. This research collects data from 384 online questionnaires and then analyzes data with Chi-Square test and Chi-Square Correlation. The research reveals that the difference of demographic factors influence to customers’ buying decision for online products by genders age education occupation average revenues and marital status. The customer recognized marketing mix factors as an important level which consistent to Kotler and Armstrong (2009) model. They indicate that marketing mix factors influence buying behaviors of customer. The most important of marketing mix factor from customers’ perspective is the process factor. The marketing mix factors (Product Price Place Promotion People Process and Physical Evidence) are related to customers’ behaviors in some aspects. The findings suggest that entrepreneur should pay more attention on the marketing mix by presenting unique online products to make differentiate from the other products in common shop. This might motivate customer’s behaviors for buying more online products. Moreover entrepreneurs should precisely focus on quality of products because consumers always complain about quality of products which exaggerated from advertisement. From this reason make consumers gain negative attitudes from buying online products which affect to next buying from customers.