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We propose to build a large water-Cherenkov-type muon-detector array (TibetMD 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 muondetector is a waterproof concrete pool, 6 m wide $\times$ 6 m long $\times$ 1.5m deep in size, equipped with a 20 inch-in-diameter PMT. The Tibet MD arrayconsists of 240 muon detectors set up 2.5 m underground. Its total effectivearea will be 8,640 m$^{2}$ for muon detection. The Tibet MD array willsignificantly improve gamma-ray sensitivity of the Tibet AS array in the 100TeV region (10-1000 TeV) by means of gamma/hadron separation based on countingthe number of muons accompanying an air shower. The Tibet AS+MD array will havethe sensitivity to gamma rays in the 100 TeV region by an order of magnitudebetter than any other previous existing detectors in the world.Comment: 4 pages, 4 figures, Accepted for publication in Astrophysics and  Space Science, proceeding of "The Multi-Messenger Approach to High-Energy  Gamma-Ray Sources", Barcelona, July 4-7, 200

Underground water Cherenkov muon detector array with the Tibet air shower array for gamma-ray astronomy in the 100 TeV region