Taking　into　account　the　limited　sales　period　and　uncertain　demand　of　seasonal　products,　the　online　strategy　and　competitive　analysis　were　introduced　to　design　markdown　pricing　strategy　specific　to　various　situations　for　retails.　The　given　strategy　is　proved　having　the　optimal　competitive　ratio.　Moreover,　the　relationship　between　the　number　of　price　markdown　and　competitive　ratio　was　analyzed　for　how　to　design　markdown　pricing　strategy.　The　feasibility　and　effectiveness　of　the　given　strategy　was　presented　according　to　the　analysis　of　numeric　examples.