The present invention relates a method for implementing a business of communication service level based on a user request. A calling user initiates a call request at least including the user's requirement information for the current communication service level; a network equipment receives the call request, detects the requirement information for the current communication service level in the call request, determines whether the user-network interface on the calling side has the capability of providing the communication service level; if yes, the network equipment analyzes the requirement information for the current communication service level and the utilization status of the network resources, obtains the strategy information relevant to the communication service level of the current call; said network equipment allocates user-network resources for the calling side according to the relevant strategy information and then the calling terminal and the called terminal establish call connection; if no, it doesn't respond to the requirement information for the current communication service level. The present invention implements the different requirements for the communication service level by the call request as the same calling user under different circumstances. It's convenient and simple to operate.