Chloromethylnaphthalene is a valuable compound for obtaining of the plant growing stimulato-napthylacetic acid. Chloromethylation of naphthalene by paraformaldehyde in the presence of glacial acetic acid, phosphoric and hydrochloric acids at temperature 80-85C and duration -6 hours the-chloromenthylnapnaphtalene yield was 55-57%. Using Box- Wilson method for mathematical planning of experiment carried out optimization of its synthesis for purpose increasing- chloromethylnaphthalene yield. Preliminary, one - factor experiments were carried out for selecting for selecting independence main parameters influencing on the synthesis. A full factor experiment of 23 with extended matrix of planning was used for optimization. Aiming to increase the-chloromethylnaphthalene yield, the obtained mathematical model was used for program of sharp raising on the reply surface. The received optimal conditions for the- chloromethylnaphthalene synthesis were selected as following: molar ratio of naphthalene-parapfsormaldehyde of 1 : 2 temperature-105C duration of the reaction - 3 hours. The yield of - chloromethylnaphthalene under these optimal conditions was 75%.