The Chiao-ba-nien incident was the last armed protest of the Taiwanese against Japan in 1915. in this incident, lost of people died at Phong-Chung, because of the violence of the Japanese military police. However, the truth of the slaughter was covered by the Japanese government. For this paper, we checked and counted the local permanent residence booklets: we can prove that the slaughter did happen, and we can count the number of people who died more accurately to bring back the truth of his incident that has been covered over for a long time.