This thesis aims at studying background of the offences of bodily harm from the past until now. It also studies the concepts and the background contents of the offences of bodily harm in foreign countries in order to analyze, compare and propose recommendations for the collection of provisions and amendments to the law to be suitable for Thailand.The study shows that Thailand has been confronted with the interpretation of terms regarding the offence of bodily harm, the offence provision is not yet clear enough and sections relating to the offence of bodily harm are separated. When considering the legal principle in foreign countries, specifically in England, India, France, Italy and Egypt, it is found that the offence provisions are categorized in the same segment and each type of guilt is also categorized to clearly define its definition.This thesis, therefore, it is recommended that the offences of bodily harm are categorized in the same segment by section accordingly. This can be achieved by amending Section 295 to Section 300 and Section 390 to Section 391 of the Criminal Code, and this will also ensure a better justice in sentencing.