A novel grain-flow yield sensor was designed. The grain-sensor impact FEM model was established with LS—DYNA software, and the impact process was simulated to discover how the sensor material influences the grain impacting sensor process. The physics grain impacting sensor test system was developed by applying LabView and a kind of high performance piezoelectric ceramic newly developed. This system was used to testify simulation result. The research shows Si3N4 is the best material of making sensor among Si3N4, PP and 1Cr18Ni9; the physics grain impacting sensor test system meets the requirement of the grain impacting sensor test without pre-amplifier by using this kind of high performance piezoelectric ceramic newly developed. The test cost is reduced greatly, the test precision is increased, and the test circuit is simplified greatly. 