A method for a mobile device to photograph a panoramic image includes: photographing, by a camera in the mobile device, a first image at a first time, and sensing, by a sensor in the mobile device, a first directing vector when the camera photographs the first image; sensing, by the sensor, an actually measured directing vector of the camera at a second time; photographing, by the camera, a second image, and sensing, by the sensor, a second directing vector when the camera photographs the second image, in case that a first trigger photographing threshold or a second trigger photographing threshold is reached; determining whether a photographing stop condition is satisfied, in case that the photographing stop condition is satisfied, generating a panoramic image based on the images photographed by the camera.