The invention provides a memory system, a memory storage method and a graphic processing system for allowing a plurality of clients in a graphic processing pipeline flow to share entity high-speed cache; wherein the memory system comprises an entity high-speed cache provided with a memory part that stores via a cache index, a at least two virtual cache spaces and at least a virtual cache controller; wherein, corresponding to the memory part, each virtual cache space has an active window with different size to that of the memory part; and the virtual cache controller executes a cache hit or miss test in the active window of the virtual cache space based on the storage requirement sent by one of the clients to the entity high-speed cache. Moreover, when the cache hit test of the cache index acquires a cache hit result, the corresponding position of the memory part stores the data. The systems and the method allow a vertex shader and a geometry shader to share the entity high-speed cache.