ã€Abstract】 The development process of large-scale vertical diagonal flow pump in China, the structure type of large-scale inclined pump adopted in our country, the existing problems and the future development trend are briefly introduced. ã€Keywords】 vertical ramp pump performance model structure trend I. Introduction Vane pump impeller exit fluid flow direction, can be divided into centrifugal pump (runoff pump), mixed (oblique) flow pump and axial flow pump. Among them, the mixed flow pump with space guide vane is generally called a diagonal flow pump. Vane pump development process is roughly centrifugal pump, axial pump, and then mixed flow pump. The first vane pump in the history of technology was a wooden drainage centrifugal pump used by the Portuguese of the 5th century AD at the Santo Domingo copper mine, which was found on July 31, 1772, in the National Museum of Paris, France. The pump impeller is fitted with double-curvature blades. The first modern modern pump for lifting liquids was manufactured by the French physicist Papan in 1705. In 1785, Ding Kesi announced a patent for a new pump, which is the prototype of an axial-flow pump. Mixed-flow pump made it clear that by the 1918 Grinney in the "water pump" a book, produced a mixed flow impeller Ellis spiral pump graphics (so mixed-flow pump, also known as spiral pump, but this is a misunderstanding The name). According to relevant records, in fact, in 1907, due to the development needs of low-lift pumps, centrifugal pumps have been partially replaced with mixed-flow pumps, diagonal pumps and axial-flow pumps in various industrialized countries and batch production has been carried out. Normally, vane pumps with a speed in the range of from 300 to 500 are referred to as skewed (mixed) flow pumps. Some of its use and centrifugal pump and axial flow pump overlap, single-stage lift up to 60m, the flow rate from 20m3 / h to the maximum flow vane pump value, the type of pump and the relationship between specific speed ... (( The following details omitted) Second, large-scale vertical ramp pump R & D, production status 1. Large vertical oblique flow pump of the typical structure type 2. Vertical oblique flow pump axial thrust bearing 3. Large vertical oblique flow pump bearing problems 4. Sea water pump prevent sea water corrosion additional protection measures Third, the development trend and the problems 1. Hydraulic model of research and development 2. Inlet flow research 3 large vertical ramp pump development 4. VVVF flow regulation methods to promote the issue 5. Design methods and related disciplines for further research