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                                 Abstract:The reconstruction method of muon tracks in the L3 Cosmic Ray Experiment has been studied.The affection caused by the non-uniformity of magnetic field,multiple scattering and other random processes have been investigated by the Geane package.After correction,the momentum resolution of the reconstructed muons was improved.
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                        References
	
			| [1] | . Innocente V, Maire M, Nagy E. GEANE: Average Tracking and Error Propagation Package, CERN Program Library, 19912. Innocent e V,Nagy E.NIM, 1993, A324: 297-3063. Adriani O et al. NIM, 2002, A488: 209-2254. LI Zhong-Chao et al.HEP  NP, 2002, 26(2) : 172-179(in Chinese)(李忠朝等.高能物理与核物理,2002,26(2):172—179)5. Adeva B et al . ,NIM, 1990, A289: 35-1026. Karimaki V. NIM, 1991, A305: 187-1917. Schmitt V. Analysis of Multi Muon Events in the L3 Detector. Diploma Thesis, 20008. VanMil A. Cosmic..Ray Muons in the L3 Detector, Ph. D Thesis, 20019. Ballest er P. Vistas in Ast ronomy, 1996, 40(4) : 479-48510. Brun R et al. GEANT 3, CERN DD/EE/ 84-1(Revised, 1987) 
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