Our institution, the University of Science and Technology of China, took part in the Large High Altitude Air Shower Observatory (LHAASO) experiment to find 12 ultra-high energy cosmic accelerators in the Milky Way galaxy. At the same time, they recorded gamma photons with energies up to 1.4 PeVatron (PeV= one thousand trillion). This is the highest energy photon ever observed by human beings, breaking the traditional perception of particle acceleration in the Milky Way, and ushering in an era of ultra-high energy gamma astronomy. The team led by Li Cheng from the State Key Laboratory of Particle Detection and Electronics, at the Department of Modern Physics of the School of Physics, was responsible for the development of the core component of the WCDA and KM2A array Muse detector in the LHAASO experiment - the large-size photosensitive probe, while the team led by An Qi was responsible for the design, manufacture and installation of a large-size electronic photosensitive probe readout system for a WCDA array. In addition, Prof. Yang Ruizhi from the Department of Astronomy participated in the data analysis, and presided over the collection of multi-band data and the theoretical interpretation of the observed data.