The Legal systems concerning prostitution have been divided into three categories: the forbidding prostitution system, the repealing prostitution system, and the registering prostitution system. Thailand previously implemented the system of addmissible prostituion. However, nowadays, Thailand has strictly prescribed the forbidding prostituion system. In the present time, there have been a variety of laws, enacted in the purpose of preventing and supressing prostitution, such as The Penal Code, the Prevention and Suppression of Prostitution Act B.E.2539, the Measures to Prevent and Suppress Trafficking Women and Children Act B.E.2540, and the Money Laundering Control Act B.E. 2542. All of which are effectively enable to criminally prosecute any person involving prostitution, for example in procuring a person for a prostitution purpose, in an offence of taking away a child or minor, in an offence against an act of being an owner or a proprietor of a prostitution parlor, and in an offence against the trafficking of woman and child, etc., or to forfeit the property of such person. Albeit having the laws to totally control these matters, the prostitution has not vanished or diminished from Thai society. For the law enforcement officers and the people in general, prostitution in some places, particularly in massage parlor, is widely known, as the place where the prostitution can be obtained.There is a number of legal factors causing the massage parlor the place where the prostitution took place. The underlying matter that caused the said problems was obviously seen in some provisions of Recreational Place Act B.E. 2509 which allowed a man and a woman to take a bath together and to have a massage in the private room having a bed in which easily created a sexual opportunity. In addition, the penalty for an owner of such places is inappropriately trivial. The difficulty of an enquiry into an evidence to prosecute an owner of recreational place or a person procuring prostitution, occurs because a witness, in some means, is partly acting against the law himself, as well as an enforcement of the law is not in effective and sufficently interesting. If there is an amendment of Recreational Place Act B.E. 2509 into imposing the penalty on prostitution and to suspend or withdraw the license of such owner, or amending an involving ministeral order in order to control a sexual opportunity in a recreational place, or taking any person associating the prostitution to be the witness by reducing the penalty, or creating the right attitude to the law enforcement officers for strictly enforcing the law, the problems in the massage parlor concerning the prostitution will be diminished.