Manipulation of various physical fields,including optics,electromagnetics,acoustics,thermotics,etc.through different materials has been a long-standing dream for many researchers over the decades.Analogous to invisible cloak and wave-dynamic illusion,thermal metamaterials can potentially transform an actual perception into a pre-controlled perception,thus empowering unprecedented applications in thermal cloaking and camouflage.Here we report our recently two works about thermal cloak and thermal illusion based on simulation and experimental validation.We demonstrate a bilayer thermal cloak made of bulk isotropic materials.Our simulation work derived directly from thermal conduction equation,has been validated as an exact cloak,and we experimentally verified its ability to maintain the heat front and its heat protection capabilities.Also we propose and realize a functional thermal illusion device,which is capable of creating multiple expected images off the original objects position in heat conduction.The thermal scattering signature of the object is thus metamorphosed and perceived as multiple ghost targets with different geometries and compositions.The thermal illusion effect is experimentally confirmed in both time-dependent and temperature-dependent cases,demonstrating excellent thermotics performance.