The preservation of paper against aging were needed to know factors which affect paper color reversion and loss of paper strength, factors in aging paper are temperature, moisture, radiation, and air pollutants etc. These lead to surface oxidation and/or hydrolysis of cellulose. The purpose of this study was to investigate phenomena during the simulated aging treatment by heat, and to prove them through many kind of methods, for example chemical, physical and optical analysis. Results were obtained that they were occurred color reversion and loss of strength. Also this reaction lead to change of surface chemical composite.