In this study, a new method was developed for combining deacidification and strengthening steps of paper conservation, by using triple mixture containing methyl cellulose, carboxymethyl cellulose and nano-micro calcium hydroxide particles in suitable ratios. This new method was developed by investigating the effects of the triple mixture at different ratios on deacidification and mechanical strength of paper samples before and after thermal ageing. It was observed that the triple mixture containing 1% (w/v) methyl cellulose, 1% (w/v) carboxymethyl cellulose and 1% (w/v) nano-micro calcium hydroxide particles neutralized acidic substitutes in paper, formed enough amount of alkaline reserve and increased tensile strength of paper by 100 %. The me- chanical strength of paper samples before and after thermal ageing was evaluated by tensile strength, folding endurance and whiteness tests. SEM pictures were also used for characterizations. The deacidification quality of new method was evaluated together with alkaline reserve, surface pH and pH of aqueous extracts.