© A grazing experiment at 0.5 ha of abandoned cultivated land and questionnaire survey for 1,487 farmers about wild boar damage on agricultural land was conducted in the Kashima City in Saga Prefecture. The questionnaire contained information about farming and damages attributable to wild boar. The most damaged was oranges (479), followed by rice (326), and vegetables (207). First, two female cattle had been grazed at 0.5 ha of abandoned cultivated land for a month to investigate the relationship between grazing and wild boar behavior. In the experiment site, the traces (animal trail, footprint, and digging hole) of wild boar were extremely decreased after grazing. But, after grazing, wild boar come again to eat some roots of plants. Automatically captured photographs using three sensor cameras also confirmed these tendency of wild boar behavior. Second, statistical analysis of the relationship between grazing and farmland damage aloud grazing area by wild boar was conducted using GIS (Geographic Information System). It showed significant difference in number of damaged farmland within 100 m from subject land between grazing land and abandoned cultivated land. In brief, abandoned cultivated land had a possibility to cause wild boar damage increase compare with grazing land. But, wild boar looked for plant roots to eat after grazing. Then, a year-round grazing was needed to avoid eating roots after grazing.