The purpose of the research were
three folds (1) to study causes and factors to push the legal reform of Thailand in the reign of King Chulalongkorn (2) to study the procuration of legal reform and (3) to study the achievements, obstacles and the impacts of legal reform. The data were collected form documentary studying and document data which considered as scholarly work such as books, articles, research papers, thesis etc.
The findings of this research revealed as follows ; 1. The ancient Thai laws which was
based on the Indian law was Dharmasastraand the three seal law which settlement in the reign of King Rama I.
2. The legal reform caused by Bowring Treaty, 1855 namely unequal treatygenerated extraterritoriality for the foreigners who dwelling in Thailand. The western nations seem to have lack of trust in Thai law and Thai courts. The exigency of Siam that was legal reform as Japan had success done.
3. Thai elite decided to adopt civil law (Roman law) and the Penal
code of1908 was the first evidence of this reform by guided by the foreigners advisors same as Japan and then Commercial code was proclaimed.
4. The legal reform sequently that is language of law, the changing of lawstudy, lawyer training, the upgrading for law profession and impact to later Thai society.
5. The achievement and obstacles of the legal reform were found that werethe sovereignty of Thai court, the equal treaty with western countries, the main obstacle
were lack of technocrats, the acceptation form western countries and the conflict among the legal drafting committee.
In conclusion, the legal reform carried out effectively accepted by civilized countries till the present day.
