How to plan the mission role of the CSAR (Combat Search and Rescue) assets is the key point of command control of the CSAR mission in modern and future military operations. In this paper, we analyze the necessary role type based on the requirements of the CSAR mission; and then model the role of the CSAR assets by means the agent diagram of AML (Agent Modeling Language), which includes the role structure and the mental states of the role, i.e. role belief, role goal and role plan; finally, we present the relationships among the mental states of the role based on the mission stage, i.e. the ingress, rescue operation, and egress, so that the CSAR mission can be planed effectively.