Muon spin relaxation/rotation (μSR) is a highly sensitive technique for investigating magnetic properties on an atomic scale. With the continuous development of this technique, the researches in condensed matter physics have been significantly promoted. Firstly, 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 La₃Ni₂O₇ and (R, Sr)NiO₂, the investigation into the charge density wave in kagome lattice superconductor AV₃Sb₅ (A = K, Rb), identifying the magnetic droplets immersed in a sea of quantum spin liquid ground state in NaYbSe₂, and the exploration of magnetic monopole near a magnetoelectric surface of Cr₂O₃. Finally, this article summarizes the current construction status and upgrade plans of muon facilities in the world.