The major purpose of this individual study is to develop a business plan for an online paint store. By surveying of targeted customer behavior and researching on both primary and secondary data from articles, journals, competitor’s website and the internet, it showed that this business has a possible opportunity of continuing growth and generating revenue. The researcher has analyzed external environment including industry analysis, competitor analysis and customer analysis. Moreover internal analysis is addressed to develop a possible marketing, operation and financial plans. To create the competitive advantage over competitors, this website business organizes under the differentiation approaches which are product and service quality, reliable, variety and simple ordering that serve all the targeted internet users’ need The financial forecast demonstrates that the business project will pay back in 2 years and 4 months with the Net Present Value (NPV) of 248,453.2Baht and Internal Rate of Return (IRR) of 26.61%. This project shows the short-term payback period while committing a satisfactory rate of return. In conclusion, collectively combining with a possible marketing plan and an efficient operation, this project will be very appropriate and worth the investment.