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Outline of a grain yield monitor for head-feeding combine is presented in this paper. It consists of two grain flow sensors, a single kernel moisture sensor, an RTK-GPS and so on. A method to correct the time lags in the separation and cleaning section and the circulation of grain flow using a return flow sensor is adapted to obtain the accurate grain yield. The yield monitor was installed on a 4-row combine, and was tested in several hectares of paddy fields. In addition, a grain yield mapping software was developed for this monitor.