A charging method in One Number Links You (ONLY) service includes: delivering information of simultaneous ringing numbers bonded with an ONLY number to a Service Switching Point (SSP) by a Service Control Point (SCP) of an Intelligent Network when the SCP receives a request for calling the ONLY number; initiating a call to the simultaneous ringing numbers and detecting an off-hook-and-answering number among the simultaneous ringing numbers by the SSP; and calculating charges of the off-hook-and-answering number after the call is terminated. With the charging method provided, accurate charging between an ONLY number and its bonded simultaneous ringing numbers can be implemented.