A service process control method and a network device. The method includes: selecting, according to an execution policy of at least one service deployed on a network device, M data processing modules for processing a packet received by the network device, and determining a processing sequence for the selected M data processing modules to process the packet; and invoking the selected M data processing modules to sequentially process, according to the processing sequence, the packet. In the foregoing technical solutions of embodiments of the present invention, an execution sequence for a data processing module to process the packet is dynamically generated according to a policy set corresponding to the service, thereby reducing an unnecessary processing process and redundant information collection in a service execution procedure, improving service processing flexibility, and enhancing overall performance of the device.