Spintronics is a key technology in the 21st century.  In our study, we use Single-Molecule Magnets (SMMs) to overcome “Moore`s Limitation”.  We have succeeded to write and read the spin orientations on TbPc₂ by Spin-Polarized STM. For the quantum computer, we have observed the spin Qubits and coherence at room temperature in MOF-Porphyrin V(IV) complexes (3D) due to the rigid lattice of MOF.  The photo-switching between SMM and classical magnet has been realized by UV and Vis irradiation, reversibly.  Finally, we have synthesized the metallic conducting SMMs with Negative Magnetoresistance.