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With merchant information increasing rapidly, customers have to spend a lot of time and energies to search for goods they need, as a result, they maybe find nothing. If merchant can respond customer’s requirements agilely when the event defined by customer appears, blindness of customer can be avoided, merchant wins business opportunities too. Protocol is the technology fundament for e-commerce. An idea for agile mechanism is introduced, this paper designs an e-commerce protocol with agility, and it discusses its security. This protocol improves e-commerce efficiency and solves activity problems.