This study adopts a case study method, and uses E15 Co., Ltd. (hereinafter referred to as E15) as a case company to understand how companies can quickly use design thinking to develop new products after facing the pandemic market plummet, and use blue ocean Strategic thinking, so that products can meet the market without falling into a price war. This study uses strategic tools such as empathy maps, value proposition maps, and STP in design thinking to develop E15 products, and then combines the relevant tools in the blue ocean strategy to converge product ideas. What are the problems faced by design thinking? How to avoid the use of tools? Combining several tools in the blue ocean strategy, the products formed through design thinking will remove the items that customers don’t need and put the value of the products that customers care about.