A method and equipment for regulating a communication parameter are provided. The method includes that: a first equipment establishes a communication with a second equipment according to a preset configuration of a Cyclic Prefix (CP) length; the first equipment regulates the configuration of the CP length according to a network state and/or service state in a communication process; and the first equipment sends CP length regulation indication information to the second equipment, the CP length regulation indication information indicating a result of regulation performed by the first equipment on the configuration of the CP length; wherein the first equipment is network equipment, and the second equipment is terminal equipment.