With the technical innovation diffusion, enterprises adopt the newest techniques to collect analysis and process the users' information to support the marketing, where the security of information transaction and users' privacy invasion risks has become a big problem. The current researches mainly focus more on discussing the impact of privacy concern on behavior intention in a simplex context, but less on exploring the change of the impacts when the contexts is different. To address the problem, this paper utilizes task type theory to divide the online environment into four types (online shopping, job hunting, gaming and searching) and proposes the research hypotheses based upon the expectancyvalue theory. The experimental results show that, except C2C website, privacy concern does not have significant positive effect on protection intention in other three websites. In the four contexts, the difference of privacy concern is not significant but the protection intention is. Finally, the suggestions are made based on the aforementioned results.