The  Large High Altitude Air Shower Observatory (LHAASO) as the largest  ground based Gamma Ray detector array is built up. The 3/4 array has  been operated for months. Many VHE gamma ray sources has been observed  including well known sources such as the Crab and Mkr421. With many  sources found having strong emission of gamma rays in UHE(> 0.1 PeV)  band, LHAASO starts the era of the UHE gamma ray astronomy. With its  unprecedented sensitivity at energies above 10 TeV and extremely high  background rejection capability, super-PeV gamma-like events, including  the record high energy of 1.4 PeV, are detected first time in history.  With also measured SEDs of several galactic gamma sources above 0.1 PeV,  LHAASO reveals that our galaxy is full of PeVatrons. The extreme  features of the electron PeVatron inside the Crab pose strong challenges  to models and even more fundamental theories. Those exciting  discoveries enable an exploring for hadronic PeVatrons which are origins  of cosmic rays. With the operation of the full scale LHAASO array  starting now, more exciting observational results will be highly  anticipated.