A new combine equipped with screw type threshing and separating mechanisms, which is adaptable to not only rice, but also many other kinds of crops, was developed, and a series of field tests of harvesting wheat and borley, rice, and soybean were carried out. The results made clear that the harvesting performance of the new combine showed the total grain loss rate lower than 3% and percentage of damaged grains less than 1% for any of these crops. For further improvement of the performance, tests with more kinds of crops under more varied crop conditions will be carried out.