The good reason for Mae Hong Son’s border trade is a variety of traders in the province, both Thais and Burmese (alien traders) shared leading role along the trade border. People on both sides are deep roots in relationships and living by together. The border trade of Mae Hong Son has 2 categories, i.e. the actual border trade and the border trade in term of international trade. Firstly, the actual border trade means trade in real qualities. There is no part of a by law “status of person” giving effect to the traders no matter they are Thais or Burmese, that is to say that, no provided law or formal trade regulation prevent the Thais and Burmese (alien traders) to operate their usual trades. Secondly, the border trade in term of international trade means by law international trade, legal issues such as “status of person” as provided by law or certain trade regulations are enforceable, particularly, on alien traders, a limitation for doing business in Thailand, as seen in the Alien Business Act B.E. 2542. Although Thai traders have no concern with Alien Business Act B.E. 2542, there are some difficulties as to trade regulation or trade policy or, in certain aspect, it is enforceable as if law, issued by officials in the area. On part of the alien traders, found that difficulties are rigorously on legal issues particularly by Alien Business Act B.E. 2542, provided that an alien by illegal entry is strictly prohibited from doing business in the Kingdom of Thailand. The illegal entry comprises illegal entry by fact and illegal entry by presumption of law. On the other hand, Thailand has its policy regarding the improvement on the “status of person”. The alien entered illegally, nevertheless having been permitted to temporary stay in Thailand could be approved status to be alien entered legally and gain permanent stay, or to gain status as Thais or Thai citizen. For some groups of alien entering illegally by presumption of law, Thailand also has its policy regarding the improvement on the “status of person”, that is, the alien entered illegally by presumption of law could be approved status as Thais or to gain Thai citizen. With regard to Alien Business Act B.E.2542, provided that the aliens born in Thailand, without having Thai nationality and the alien whose the Thai nationality has been withdrawn, allows to do business in Thailand under regulation provided by this Act. However, there is no announcement put into practice at the time. In this case, this group is presumed by law to be the “alien by illegal entry”, as mentioned earlier, with the same result, falls under the strict prohibition for doing business in Thailand. Although the Alien Business Act B.E. 2542 allows the alien by legal entry and gain permission to stay permanently to do business in Thailand, by Lists attached to the Act, List 1 - 3, there are requirements that the categories of business must be specified by the Committee under this Act. Each list is variable from the others on limitation to carry on business under the Act, so that the requirement must be furnished, i.e. the request must be submitted by the Mae Hong Son’s officials to the discretion of the Committee providing the lists in order to specify the List and then allow the alien traders clear and complete access into Mae Hong Son’s border trade.