Due to the prosperity of cross-border online transactions, it is unavoidable for a citizen to use the payment service provided by a foreign payment institution. Most advanced countries in the world have completed the legislation of payment service.Right now, the payment service act is on the legislation procedure in Taiwan, and it is expected to be completed by 2014. There is no doubt that the payment service should be regulated to protect the consumers and prevent money laudering activities. However, how to apply local payment service regulations to a foreign payment insitutions that provides payment service to the citizens remains a complicated legal issue. In the international law aspect, according to legislative jurisdiction, it is legal for a government to legislate a foreign entity. However, according to excutive jurisdiction, a goverment could not enforce its authority within another territory. This assay explains how U.S.A, U.K, German, Japan and Singapore deal with this tough problem in their payment service regulations. In addition, it demonstrates related statutes of cross-border payment service in Taiwan. Comparison and analysis of those foreign regulations, and a suggestion toward payment service regulation of Taiwan, are presented in conclusion."