A method for implementing Intelligent Network (IN) services is disclosed, including: setting an IN service as a combination of several service feature, and each service feature corresponding to a node type; selecting service features from the combination, and configuring invoking relationships of the selected service features, and each invoking relationship involving a head node and a tail node, wherein a node that is always a tail node is a primary node and one primary node corresponds to one service user number; and upon receiving a service request from a user terminal, determining the primary node based on the service user number; and performing the selected service feature respectively, beginning from the primary node, according to the order of the invoking relationships, to implement the IN service. This method makes the sub-service procedures of each service user independent from each other, with high efficiency, less workload, and more flexibility and convenience.