A method for ranking contact persons of an address book comprises: counting a communication event corresponding to a contact person in an address book and an event factor corresponding to the communication event; according to the communication event corresponding to the contact person in the address book and the event factor corresponding to the communication event, calculating the ranking weight of each contact person; and conducting ranking according to the ranking weight of each contact person. A system for ranking contact persons of an address book which corresponds to the abovementioned method can automatically calculate the ranking weight of a contact person through an established policy, and preferentially display the contact person with a high weight in the front of an address book, thereby facilitating a user in searching.