The purpose of this research was to study factors affecting disciplinary offences committed by police officers, to study general conditions affecting disciplinary offences committed by police officers and to find the ways or measures to solve the problems; especially among police officers at Crime Suppression Division. The hypotheses of this research were as follow: 1. Police officers in lower Rank tended to commit disciplinary offences more than those in higher Rank. 2. Police officers who worked longer tended to commit disciplinary offences more than those who worked shorter. 3. Police officers who had lower income tended to commit disciplinary offences more than those who had higher income. 4. Police officers who had older tended to commit disciplinary offences more than those who were younger. 5. Police officers who had lower education educated tended to commit disciplinary offences more than those who had higher education. 6. Police officers who were committed disciplinary offences tended to commit more disciplinary offences more than those who never committed. 7. Police officers who believed in materialism, tended to commit disciplinary offences more than those who were not materialism. 8. Police officers who had more power tend to commit disciplinary offences more than those who had less power. The finding of this research were in accordance with every hypotheses except number two and four.
