The main purpose of this special project is to develop a business plan of web site for design via crowdsourcing which is the first one in Thailand. Primary data and secondary data are used. The primary data is collected by sending questionnaires to gather opinion and behavior. Two different questionnaires are sent to two target groups. The first group is people who use design services such as entrepreneur, some departments in companies. The second group is designers who work in design companies or work as freelances. And the secondary data is from books, articles and the Internet. Moreover, the researcher has also analyzed both internal and external environments which are industry analysis, competitor analysis and customer analysis. All results of analysis are considered to make every plans integrated. The web site's name is CROWDidea.com. The usage of web site is unique in Thailand. First of all, people who want a design can start a contest project in website. Then, many designers will visit the site and participate in the project by sending their designs. After that, the project’s owner will select the best and suitable design as he/she want and award the winner. The income of web site comes from project’s fee. By the financial estimate, this project will pay back in 2.9 years with the net present value, NPV, of 249,096 Baht and internal rate of return is 30.77%. So this project is worthwhile for investment.