Metasurfaces provide a potent platform for the dynamic manipulation of electromagnetic waves. Coupled with phase-change materials， they facilitate the creation of versatile metadevices， showcasing various tunable functions based on the transition between amorphous and crystalline states. However， the inherent limitation in tunable states imposes constraints on the multiplexing channels of metadevices. Here， this paper introduces a novel approach - a multi-functional metadevice achieved through the two-level control of the encoding phase-change metaatoms. Utilizing the phase-change material Ge₂Sb₂Se₄Te₁ （GSST） and high refractive-index liquid diiodomethane （CH₂I₂）， this paper showcases precise control over electromagnetic wave manipulation. The GSST state governs the tunable function， switching it ON and OFF， while the presence of liquid in the hole dictates the deflection angle when the tunable function is active. Importantly， our tunable coding metasurface exhibits robust performance across a broad wavelength spectrum. The incorporation of high refractive-index liquid extends the regulatory dimension of the metadevice， enabling dynamic switching of encoding bit levels. This two-level tunable metadevice， rooted in phase-change materials， presents a promising avenue for the dynamic control of functions.