An electronic device with camera assembly which can be deployed and can be retracted allows a maximum size of display screen on a front surface of the device. The device includes a housing and at least a first lens module if not an additional and second lens module. The housing includes a front surface with a display screen and a back surface. The back surface defines a receiving groove receiving the first lens module. The first lens module is received in the receiving groove and capable of being stretching out of the receiving groove to face a front side of the electronic device when deployed, to capture a scene in front of the device. A controlling method suitable for a first lens module and/or a second lens module to capture a front scene and a rear scene is also provided.