  We propose to build a large water-Cherenkov-type muon-detector array (Tibet
MD array) around the 37,000 m$^{2}$ Tibet air shower array (Tibet AS array)
already constructed at 4,300 m above sea level in Tibet, China. Each muon
detector is a waterproof concrete pool, 6 m wide $\times$ 6 m long $\times$ 1.5
m deep in size, equipped with a 20 inch-in-diameter PMT. The Tibet MD array
consists of 240 muon detectors set up 2.5 m underground. Its total effective
area will be 8,640 m$^{2}$ for muon detection. The Tibet MD array will
significantly improve gamma-ray sensitivity of the Tibet AS array in the 100
TeV region (10-1000 TeV) by means of gamma/hadron separation based on counting
the number of muons accompanying an air shower. The Tibet AS+MD array will have
the sensitivity to gamma rays in the 100 TeV region by an order of magnitude
better than any other previous existing detectors in the world.
