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The integration of Internet of Things (IoT) and social networks is the important trend of new network technologies, which is Social Internet of Tings (SIoT). In many application scenarios, SIoT are controlled by different authorities. And the network nodes belong to different domain can share the sensor data by standard protocols. Moreover, in a mission-critical application scenario various types of data generate by all kinks of the nodes of SIoT may belong to different security levels, and thus are meant to be accessed only by selected types of users. Therefore, a fine-grained cross-domain access is the core problem for it. To address this, this paper focus on the fine-grained cross-domain access control mechanism of SIoT, which including trust model for certificate authority, user login protocol, cross-domain secure authentication protocol, and cross-domain fine-grained access control. The simulation results show the …