The rapid economic development in China has led to increasing freight transport, as well as fierce competition among the hubs in the region, such as Hong Kong, Busan, Kaohsiung Harbor, and new harbors in Shenzhen and Shanghai. The transport not only support the rapid development of harbors in the region but also result in intense port competition. The competitive advantages, such as location, facility, efficiency, and highly concentrated ship routes, possessed by the harbors are not everlasting. In the face of changing environment and competition, the competitive advantages may be lost. When competing in a different niche market, the location advantage may turn into disadvantage, even damaging its leading position in worse cases. In response to changes, harbor administrators should probe into the future trend in changes of the freight transport market, discuss all possible scenarios, sense the potential risks and opportunities, seize the opportunities and utilize the existing advantages to build up the competitive advantages for the future. Compared to Kaohsiung Harbor, harbors in China, such as Shanghai and Shenzhen, as the entry gates to the main economic and trade zone in China and the central region in terms of sources of goods, have developed into regional pivot harbors. Due to the barrier of Cross-Strait direct shipping, some scholars in Taiwan believe that Kaohsiung Harbor is facing the problem of becoming periphery. However, even after the direct route comes into practice, the competition from harbors in China may be a threat to Kaohsiung Harbor, even occur haidding effects to take over its existing transit goods. The position of Kaohsiung Harbor may be challenged. This study investigates the potential influence of Cross-Strait direct shipping and the competition from China on the quantity of containers, route planning, and shipping business investment with questionnaire survey on sea transportation businesses, and constructs possible scenarios in short-term (2004-206), medium term (2007-2010), long-term (2011-2020). Before the Cross-Strait direct shipping into practice, Kaohsiung Harbor will continue to grow due to continuous economic development in the region. If the Cross-Strait direct shipping comes into practice or the Chinese government permits more direct shipping harbor, Southern China, Fukien, and Zhujiang Delta will become the main regions in terms of sources of goods. However, the rate of growth may not meet the expectation. In the long-term (2011-2020), due to the rapid of the quantity of containers in China and the transit ability of harbors in China, the route structure and the shipping business investment in Kaohsiung Harbor will suffer more obvious disadvantageous impact.