A method of handling a point-to-multipoint (p-t-m) Multimedia Broadcast Multicast Service (MBMS) service in a wireless communications system includes the following step of receiving a message used for carrying information of the p-t-m MBMS service via a first channel when a radio resource control (RRC) state of the receiving terminal is a dedicated state. The message includes an instruction utilized to indicate the receiving terminal to release resources used for receiving the p-t-m MBMS service. Otherwise, the method includes the step of adding an instruction into a message used for carrying information of the p-t-m MBMS service when the message is transmitted to a receiving terminal via a dedicated channel. The instruction is utilized to indicate the receiving terminal to release resources used for receiving the p-t-m MBMS service.