Recently, there’re several serious problems for the Taiwanese securities industry facing on. They are the industries moving out, new securities distribution regulation, the rule of alternative minimum tax issuing, and Hong Kong announced to eliminate the duty of inheritance tax since 2005. Many Taiwanese securities companies were trying to explore new markets, of course, all of them should have had their eyes on the Main Land China. Taiwanese government has granted the securities company to broad themselves and invest the Chinese securities company directly, but there’s no financial cooperation memorandum between Taiwanese and Chinese governments, till now, Taiwanese securities companies still couldn’t extend their hands on Chinese securities market to generate great profits. In the overly competition circumstances, what can the Taiwanese securities companies do for themselves? All of Taiwanese securities companies’ concentrations are at the Chinese securities market. Before there’s any better change in Taiwanese securities policy about the company invests in China, all they used establishing the subsidiary in Hong Kong as a stone for preparing to enter into Main Land China. Especially, Hong Kong has pronounced to eliminate the duty of inheritance tax in 2005, the policy made many Taiwanese transfer their assets into Hong Kong in order to avoid the tax duty. As a Taiwanese securities company, learning such situations, they will try to plan and construct their new business network in Great China (Taiwan, Hong Kong and Main Land China). Whenever Taiwanese government releases the securities company to invest subsidiary in China, surely they will be ready for it. The thesis will analysis few cases, which is about the securities companies’ internal and external environments, their extension in Great China, and describing the business trend in the future. We also try to plan the workable strategy in suggestion, and hope that will help for working their missions.