The outsourcing of the business logistics activities have became a trend. The goals of my research want to understand that: (1) The outsourcing extent of the logistics activities. (2) The logistics outsourcing considered factors. (3) How the firm size affect the (1) and (2). (4) How the logistics network complexity affect the (1) and (2). The research¡¯s samples are the PC and peripheral equipment companies in Taiwan. The capital, the revenue, and the number of the employee measure the size of a firm. The logistics network complexity is measured by the number of the customers, the number of the suppliers, the number of the countries that customers in, and the number of the countries that the suppliers in. The result shows that the companies think the cost saving factors is most important when they decide to outsource the activity. The great extent of the traffic transportation, salvage and scrap disposal and return goods handling are outsourced. The companies whose sizes are small put great emphasis on the ¡°logistics information systems¡± factors. The big companies have a tendency to outsource the physical moved activities like traffic transportation, salvage and scrap disposal. The small companies are apt to outsource the process handling activities. In the logistics network complexity, the suppliers make greater difference in the outsourcing logistics activities than the customers. The numbers of the countries affect the logistics outsourcing considered factors.