A connector system includes a socket and a plug. The socket includes a receptacle and a recess communicating with the receptacle. The plug includes a main body, a locking element and a spring. The main body is inserted in the receptacle to electrically connect the plug with the socket. The locking element is retractably mounted to the main body. The spring drives the locking element to be latched in the recess. When the pressing block is pressed, the resisting panel drives the latching block releasing from the recess.