The purposes of this thesis is to discover theinternationally-accepted rules relating to arrest ofsea-going vessels and to observe any obstacles arisenfrom uncompatibility of Thai legal provisions and theinternational laws According to this research, it is found that someprovisions of Arrest of vessels Act of B.E. 2534 areinconsistent with the international laws which aredeemed universal. Those provisions are related toqualification of a claimant who can request for anarrest, the scope of maritime claims, types of thearrestable ship and jurisdiction. This thesis thereby provides recommendations foramendment in some aspects of Arrest of vessels Act asfollows: 1. To entitle the claimant domicile abroad to apply for arrest of vessels in Thailand. 2. To expand the scope of the rights falling within the meaning of maritime claim . 3. To extend the right to arrest the particular ship, although the ship was later transferred to thrid party.