With its rapid development, network groups have played an important role in the society. For network groups, online trust is the precondition of their survival on the internet. Online trust does not come into being overnight, instead, it is gradually formed by network groups in the cyberspace. The construction of online trust generally experienced several stages, including preliminary, maintaining and deepening, broken periods, and even reality trust. Furthermore, acquaintance is basic; benefits promote its establishment; resources exchange and discipline systems maintain and deepen such relationship. However, after several games, the relationship may be weakened and even split. As a result, only a little online trust obtain a stable development, and finally transform to real trust.