E-commerce industry like Open Market and Social Commerce has been growing rapidly around the world. E-Commerce makes people be able to purchase goods or use service in resonable price by promoting competition within sellers, and its range is increasing into many areas. The market also changed in order that more and more people use mobile application than PC device for their online shopping with highly-advanced payment technology. Social Commerce company like 'Coupang', 'Ticket Monster' and 'We Make Price' designed their service more fit to the mobile device. However, as the Open Market company like '11 Street', 'Auction' and 'G-market' has grown based on PC device, their change to mobile device occurred at a slow pace. The difference between two market led to the gap of usability of mobile application. To improve the usability, usability evaluation of E-commerce application should take precedence. Therefore, this paper intends to set up the evaluation factors of E-commerce application.