Objective To discuss the efficacy of abdominal acupuncture on drug-dependent insomnia and establish the theoretical basis for it with clustering analysis. Methods 30 patients of drug-dependent insomnia were treated with abdominal acupuncture,and the pre-and post-treatment results of Pittsburgh Sleep Quality Index（ PSQI） and symptom self-evaluation scale（ SCL-90） were compared. The data were processed with clustering statistics and dimension reduction analysis to discuss the theoretical foundation for the treatment. Results The pre-/post-differences of PSQI and SCL-90 scores were both statistically significant（ P < 0. 05） after four weeks of treatment,with post-treatment scores lowering than that of pre-ones. The items " somatization" on SCL-90 of 14 out of 26 patients turned from positive（ pre-） to negative（ post-） with T value reducing from 2. 56 to 1. 96. Conclution Somatic symptoms can be greatly improved by abdominal acupuncture after the treatment as the movement of qi and blood could be invigorated and adjusted and the meridian and collateral system could be smoothed.