Abstract: Utilizing virtual instrument technology, a telemetering system of combine feed quantity was developed based on LabVIEW software，and simulation tests on rice platform were conducted successfuly. Through the tests, the applicability of feed quantity sensor based on the testing principle of extruding force was proved, and the linear mathematical model for testing rice feed quantity was preliminarily set up. The testing results provide the scientific basis and technical means for field experiments on real-time measuring of feed quantity of GPS combine .