Highlights from the Tibet AS$\gamma$ experiment

The Tibet AS$\gamma$ experiment, observing cosmic rays/gamma rays above a few TeV, is located at 4,300m above sea level, in Tibet, China. The experiment is composed of a 65,700 m$^{2}$ surface air shower array and 3,400 m$^{2}$ underground water Cherenkov muon detectors. The surface air shower array is used for reconstructing the primary particle energy and direction, while the underground muon detectors are used for discriminating gamma-ray induced muon-poor air showers from cosmic-ray (proton, helium,...) induced muon-rich air showers.Furthermore,the underground muon detectors turn out to be effective to select the proton component in cosmic rays. We present recent results on mainly sub-PeV cosmic gamma-ray observation from the Tibet AS$\gamma$ experiment.