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The objective of the study is to compare Ag/Al2O3 catalysts prepared by Sol-Gel Method and Reaction Synthesis Method.And the catalysts are characterized by XRD and TEM techniques.The results shows the silver particles dispersed among the alumina aggregates, sizing 100nm by Reaction Synthesis Method, but the samples is smaller than 35nm by the Sol-Gel Method.XRD analysis of the Ag/Al2O3 samples by Sol-Gel Method evidences the formation of γ-Al2O3 phase for all samples with no visible reflection assigned to Ag or AgO, and it indicates Ag is highly dispersed on γ-Al2O3 phase.