Abstract: Due to the differences between hydraulic pipeline flow measurement and flow measurement of pipelines transporting general fluids, a truly satisfactory dynamic flow measurement instrument has yet to be found in the hydraulic field. Based on the research on flow measurement in hydraulic systems using the pressure gradient method, this paper proposes a new method that eliminates the need for pressure tapping and allows a MEMS sensitive core to directly obtain the differential pressure signal corresponding to the flow rate within the pipe, utilizing the advantages of traditional V-cone flowmeters. The pressure difference before and after a specially designed V-cone embedded in the pipeline is measured using a MEMS force-sensitive core. A flow-differential pressure mathematical model is derived, and the influence of different key parameters of the V-cone on the flow field pressure is simulated using Fluent. The conclusion is that the front cone angle and equivalent diameter ratio should be taken as large values ​​during design. This provides guidance for the optimized design of V-cone flowmeters. Keywords : Hydraulic system; Flow measurement; V-cone; MEMS; Key parameters; Fluent Introduction Flow measurement is an important parameter in industrial process measurement, involving a wide range of applications. Flow rate, temperature, and pressure are recognized as the three major parameters in thermal metrology. With the development of industry and economy, flow measurement technology and products are constantly evolving. However, most practical hydraulic systems currently only have a few pressure gauges, with almost no flow monitoring devices. In the process of flow measurement in the hydraulic field, a truly satisfactory dynamic flow measurement instrument has yet to be found. Positive displacement flow meters and turbine flow meters, which can be selected from engineering manuals, are not only expensive but also cause strong disturbances to the fluid, have moving mechanical parts, low response frequency, and are prone to wear. Since hydraulic systems can only measure working pressure and cannot measure the working flow of each branch in the system, it is difficult to determine the cause of a fault, forcing a shutdown and major overhaul. If online flow sensors could monitor abnormal flow conditions, combined with pressure parameters, power flow theory could be used to predict and accurately locate the fault, preventing further economic losses. (Full text available for download: Design and Simulation Study of V-Cone Flow Meter for Hydraulic Systems Based on MEMS )