In order to observe the therapeutic effects of Ling Gui Zhu Gan Tang Mixture (芩桂术甘汤) on obesity induced by psychoactive drugs, 100 psychotics with obesity induced by psychoactive drugs were randomly divided into a treatment group (50 cases)and a control group (50 cases) for a 8-week treatment.The changes were determined by means of the Brief Psychiatric Rating Scale (BPRS) and the Treatment Emergent Symptom Scale (TESS) with the body weight recorded before and after treatment. The results showed that the total effective rate was 72% in the treatment group, and 14% in the control group,with the former obviously superior to the latter (P＜0.01). The BPRS scores were 33.02t7.34 in the treatment group and 32.39± 3.51 in the control group before treatment; and 20.38±5.10 in the treatment group and 20.82± 1.75 in the control group after treatment. The BPRS scores were obviously reduced after treatment in the two groups (both P＜0.01), but with no significant difference between the two groups (P＞0.05). This indicates that the Ling Gui Zhu Gan Tang Mixture does not influence the curative effect of the psychoactive drugs while showing the body weight-reducing effect. Therefore, the Ling Gui Zhu Gan Tang Mixture can be used for those psychotic patients with obesity induced by the psychoactive drugs (the incidence is 10-25%) in their continuous course of treatment with the latter drugs.