On April 5th, 1996 afternoon, at 4:26Pm, the Formosa airlines B-122S7, when landing carelessly, dropped into the sea. Five passengers died, one missing and the rest eleven passsengers including the pilot and co-pilot luckily survived. Civil aviation investigation determined that it was pilot's error that cause this accident. Intruding from the angle of medical studies, from autopsy report, injury pattern analysis, escape procedure, to aviation medical study and judement, this essay makes a further evaluation in analysing human factor. As the pilot and co-pilot face court prosecution for the offense of abandonment by procurator at Kin Men, the conclusion of this investigation, could it be made according to the prosecution of the pilots? This essay provides four related cases for reference.