Cement water demand in vertical roller mill processing has attracted the attention of cement users, especially in the commodity concrete developed areas; more and more users of cement put forward higher and higher requirements for water demand. Concrete producers want to choose cement with small water demand, which will affects the competitiveness and price of cement products, then affecting the cost and benefit of cement producers.There are many factors that affect the cement water demand in vertical roller mill processing; one of them is grinding process. In other words, different grinding process produced cement; the water demand is not the same. If you want to improve the efficiency of the grinding system, no matter what kind advanced grinding process, we must consider the appropriate water demand of cement technology. Otherwise, we must find a balance between the grinding efficiency, the grinding cost and the water requirement.