The study based on the Technology Acceptance Model, added the three variables of trust, perceived risk and social impact, and through the Internet survey respondents, using structural equation modeling to explore the three variables affect the user's intention use and actual use in the context of online shopping order-processing system. The results show that the orders of direct impact on the intention use of online shopping order-processing system users are perceived ease of use, trust, perceived usefulness, social impact, respectively; the orders of direct impact on the actual use are intention use, trust and social impact, respectively. It is interesting that the perceived risk has no significant impact on both user's intention use and actual use, but rather through trust mediated to affect intention use and actual use.