Abstract: For precision agriculture information technology, a method based on the weighing was put forward to get grain yield distribution information. According to grain transmission characteristics of traditional combines, a flow sensor by spiral propulsion and weighing device was studied. The problem of measurement device power directly transmiting and effective signal detecting was solved with this method. Using the wavelet filter short-term treatment with real-time measuring data, combined with GPS positioning information, dynamic measurement of combines grain flow and the grain yield distribution information were realized. Test results show that the bench test error is less than 2%. Test shows that grain yield distritubion information can be gotten by this method.