According to the reality of campus network’s double-export，this article designs and applies an optimized strategy of double-export routing based on firewall. After analyzing the campus practice and the importance to optimize the double-export routing, a new optimized strategy is designed which can balance the flux between two exports by static routing and NAT technology. An actual configuration and application of interface and area, routing and NAT, the syslog of the firewall are given. So the strategy can be applied in the double-export of campus network to achieve high speed and stability.