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                                 Abstract:The characteristics of high energy γ-rays are studued using emulsion chamber installed at Mt. Ganbala, Tibet, 5500 m high above the sea level, at atmospheric depth of 520g/cm2. The vertical flux, integral energy spectrum, zenith-angle distribution and the attenuation length in the atmosphere for the high energy γ-rays are obtained. The comparsion of the results with those of the similar works shows satisfactory agreement. Several γ-ray families are selected and analyzed and the energy spectrum, fractional energy spectrum and the mean values of the transverse momentum of γ-rays in the families are obtained and discussed.
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                        References
	
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				| [1] | ZHOU Yong-Zhao
								, LIANG Hao
								, XUE Jun-Dong
								, CHEN Yi-Xin
								, YANG Tao
								, GONG Da-Tao
								, JIN Ge
								, YU Xiao-Qi
								. An Online Program for Monitoring KLOE Experiment. Chinese Physics C,
							2002, 26(6): 620-625. |  
				| [2] | WU SHI-SHU
								. ON NUCLEAR SINGLE-PARTICLE POTENTIALS(Ⅲ)SINGLEPARTICLE ENERGIES DETERMINED BY THE NONHERMITIAN POTENTIAL Uαβ=Mαβ(εβ). Chinese Physics C,
							1979, 3(4): 469-483. |  
				| [3] | CHANG KONG-LIANG
								. DIMENSIONAL METHOD TO SOLVE THE DIFFUSION CONVECTION EQUATION OF SOLAR COSMIC RAYS. Chinese Physics C,
							1978, 2(3): 200-210. |  
 
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