In the combined strain pressure sensor, the elastic sensitive element can be divided into a sensing element and an elastic strain element. The sensing element converts the pressure into a force that is transmitted to the most sensitive part of the elastic strain element, while the strain gauge is attached to the maximum strain of the elastic strain element. In fact, the more complicated strain tube type and strain beam type belong to this type. The sensing elements include diaphragms, bellows, bellows, Bourdon tubes, etc. The elastic strain elements include cantilever beams, fixed beams, truss beams, ring beams, thin-walled tubes, and the like. They can be combined into a variety of types according to different needs. The strain gauge pressure sensor is mainly used to measure the dynamic or static pressure of the flowing medium, such as the pressure of the inlet or outlet gas or liquid of the power pipeline equipment, the pressure of the internal combustion engine pipeline, and the like.