In summary, the mass hierarchy problem is a fundamental challenge in particle physics that refers to the lack of knowledge about the masses of neutrinos. The JUNO experiment is a cutting-edge neutrino detector that is designed to solve the mass hierarchy problem. The detector uses a innovative design to detect neutrinos, which involves using a large, spherical detector that is filled with liquid scintillator. The experiment is expected to provide a wealth of new information about the masses of neutrinos and is a significant step forward in the study of neutrinos and their properties.