The invention discloses a method for implementing a strategy label based on IPv4. The method comprises the steps of taking a highest order reserved field of a Flags field in an IP message header as anindication field of the strategy label for expressing whether the strategy label is included in the IP message header, and defining the strategy label using an Identification field in the IP messageheader. By adopting the technical scheme of the invention, by decoupling IP forwarding control and strategy control, a network is managed more reasonably; and an existing device can be compatible, sothe upgrade on the whole network does not need.