Software defined networking brings many possibilities to network security, one of the most important security challenge it can help with is the possibility to make network traffic pass through specific security devices, in other words, determine where to deploy these devices logically. However, most researches focus on high level policy and interaction framework but ignored how to translate them to low-level OpenFlow rules with scalability. We analyze different actions used in common security scenarios and resource constraints of physical switch. Based on them, we propose a rule translation implementation which can optimize the resource consumption according to different actions by selecting forward path dynamically.