Digital coupon, a popular e-commerce application, which makes the coupon circulating on internet by the digital forms. The real commercial system hasn’t presented yet in current domestic. The problem lies in the e-business model, anonymous, fair transaction, and free circulation. In this research, the author analyzed the domestic and foreign researches, defined the e-business model of mobile e-coupons, puts forward a set of digital coupon protocols with offline presentation, offline payment, and verified the anonymous, fair transaction, free circulation of the protocols. This study derived a test system has good efficiency, implementation, practicability and innovative. The obtained theory and experience can be a meaningful reference to other studies in relevant fields.