The study proposes a novel routing architecture, accountability realm based routing architecture (Arbra for short), to sovle prefix hijacking, routing forgery and source address spoofing. In Arbra, the accountability realm (AR) is an independently administered network operated by distinct administrative unit and also the basic element of network topology. Because AR should be responsible for the network actions of users in it, the paper calls it the accountability realm. This paper first designs a mapping method from automous system to AR, and then proposes a two-level routing architecture based on AR. Further, the study builds a routing design framework, which mainly includes a hybrid addressing scheme, core routing protocol, identifier mapping protocol, packet transmitting process and public key management mechanism. Finally, Arbra and other famous routing architecture (such as LISP, AIP, etc) are compared, and the study analyzes the security, scalability, performance and deployment of Arbra. Analysis and evaluations show that: (1) Arbra can solve prefix hijacking, route forgery and source address spoofing; (2) the routing table needed by Arbra is smaller, so we can say that Arbra has better scalability; (3) the performance and deployment cost of Arbra is reasonable. Above all, it is clear that Arbra is a feasible secure routing architecture.