A method of single-cell point-to-multipoint (SCPTM) transmission for a network in a wireless communication system is disclosed. The method comprises performing a query procedure to obtain information associated with a number of mobile device interesting or receiving at least a SCPTM service, and determining to turn on/off data transmission for the at least a SCPTM service, turn on/off feedback procedure for the at least a SCPTM service according to the obtained information, or to provide the obtained information to a group communication service application server (GCS AS).