with the rising demand for resource and energy，China has strengthened its trade with South Pacific island countries since the beginning of the 21st century. An important feature for the trade is that the total trade volume between China and South Pacific countries having no diplomatic relations with China is even higher than those with diplomatic relations. By analyzing customs data in the past decade，this paper finds out that the main cause for this phenomenon is that the Marshall Islands and the Solomon Islands，the two countries having no diplomatic ties with China，have a large trade volume with China. The Marshall Islands mainly conducts entrepot trade with China by establishing offshore company registration system with favorable policies and this entrepot trade can，to some extent，avoid customs tariffs. Thus，it has now become an important way of China’s entrepot export. The Salomon islands mostly make complementary commodity trade with China，with the two sides exchanging what the other side needs. Based on the two cases，this paper further draws the conclusion that China and South Pacific trade has gradually involved from being dominated by “political factors” to “endogenous economic factors”.