In the accident of China Airline's airplane B-1816, on April 26th, 1994 around 8:17 p.m. (Japan local time), out of 271 passengers 264 were dead, seven seriously injured. Till now more than two years, the Aircraft Accident Investigation Commission of Japan was undergoing deep and careful investigation for this case. The result of the investigation was formally announced at Tokyo on July 19th, 1996. The causes of the accident involve no proper design of auto flight system of Airbus 300 of the airplane and pilots poor judgement and operation, also arguments of medical investigation about alcohol level in the blood, providing description. At the same time the Japan aircraft accident and investigation organization related laws provide references.