Negotiation processing method for security algorithm, control network element and system

The embodiments of the invention provide a negotiation processing method for a security algorithm, a control network element and a system. The negotiation processing method for the security algorithm comprises the following steps that: the control network element selects the security algorithm supported by both first user equipment (UE) and second UE according to the security capability of the first UE and the security capability of the second UE; and the control network element informs the first UE and the second UE of the selected security algorithm. According to the embodiments of the invention, security algorithm negotiation between the two UE in near-field communication can be realized under the control of the control network element.