beta-Methylpentadecanedioic acid dimethyl ester (I) was synthesized electrochemically by Kolbe reaction using beta-methylglutaric acid monomethyl ester (II) and alpha,omega-dodecanedioic acid monomethyl ester (III) as starting materials in MeOH solution. Electrolysis was carried out for about 4-5 h, when solution pH greater than or equal to 7, followed by extraction with petroleum ether and distillation to obtain a colourless oily product (I). The minimum production cost occurred when the mole ratio of II to III was 1:1.38 and unreacted III could be recovered. The product synthesized (I) completely met the requirement of artificially synthesized musk.