Muon Spin Rotation/Relaxation (μSR) is a highly sensitive technique for investigating magnetic properties on the atomic scale. With the continuous development of this technique, it has significantly promoted the researches in condensed matter physics. This article introduces the advantages and uniqueness of μSR technique, followed by several recent progress contributed by μSR in the field of condensed matter physics, including revealing the magnetic ground state of superconducting nickelates La ₃Ni ₂O ₇and ( R,Sr) NiO ₂, the investigation into the charge density wave in kagome lattice superconductor AV ³Sb ⁵( A= K, Rb), identifying the magnetic droplets immersed in a sea of quantum spin liquid ground state in NaYbSe ₂, and the exploration of magnetic monopole near a magnetoelectric surface of Cr ₂O ₃. This article then summarizes the construction status and upgrading plans of worldwide muon facilities.