In priciple, metasurfaces for phase regulation based on the generalized Snell’s law enable arbitrary wavefront or spatial phase tuning via ultrathin interface with deep subwavelength thickness. Specifically, such ultrathin metasurfaces are essentially composed of anisotropic meta-elements that are eleborately arranged to achieve phase modulations pixelwisely in a subwavelength-level local manner in a full range covering [0 2π]. However, most current metasurfaces lack of the flexibility of active tuning due to their post-factication passive nature. In this situtations, the ultracompact reconfigurable devices with high-level of integration become highly desirable for a few applications such as the active photonic, optoelectronic integration and so on. Therefore, this paper aims to combine the actively tunable property of newly emerging phase change materials with the framework of metasurfaces with the functions of phase tuning based on the generalized Snell's law. As proof of concept, the far-field switchable holographic imaging is reasonably demonstrated acting as one type of meta-switch for certain scenarios of controllable hologram generation. In detail, the phase change material of germanium antimony telluride (Ge₂Sb₂Te₅, “GST” in short) alloy is integrated into the meta-atom design for the essential switchable control. For the amorphous-GST integrated device incident by the circularly polarized wave, the predefined anisotropic meta-atoms can achieve broadband (1.55~2.8 μm) geometrical phase modulation with the polarization conversion ratio (PCR) up to ~80%, producing the near-field holographic phase distribution for the far-field holographic imaging, i.e. the “on” state for our device. However, upon the phase change of GST to its crystalline state, the PCR of meta-atoms is minimized and the holographic phase and image reconstruction are then switched off. As a result, the phase-type photonic switch proposed in this paper have great potentials in active photonic and optoelectronic integration such as the spatial light modulation, wavefront engineering, holographic imaging.