Mac Cuu，who was born in Leizhou，Guangdong，he set up an quite independent regime in Ha Tien area in the late 17^th century that the Chinese were the main body，that regime is known as Can Cao.By the administration of the farther and son—Mac Cuu and Mac Tien Tu，Ha Tien was not only an important force of controlling the Indochina peninsula’s situation，but also was a prosperous international port.Ha Tien，connecting with Lower Mekong Basin through the northern river，facing Siam Bay and the lower delta that the Malay Peninsula to the South through southern sea route，controlled the traffic hub of the Indo-China peninsula，this traffic and commercial net covered the Barcelona River Basin，Kampuchea Inland areas，the east coast of the Malay Peninsula，Riau-Lingga Islands and Palembang-Bangka area.Mac’s regime had been falling into decadence in 1770s，Nguyen Dynasty ruled this area again at the beginning of 19^th century.Ha Tien became the important port in the southern coast of Vietnam，occupied an important place in modern maritime traffic and trade system of East Asia and Indian Ocean.