Total of 92 schizophrenia patients with obesity will be enrolled and divided randomly into: 1) case group, received oral administration of Cassia seed (3.0g), once/day, 12 weeks; 2) control group, received oral administration of Cassia seed placebo (3.0g), once/day (90% of starch and 10% of cassia obtusifolia), 12 weeks. The primary outcome included the changes of body mass index (BMI), waist circumferences (WC); secondary outcome measured included the changes of hemoglobin A1c (HbA1c), total cholesterol, triglyceride, high density lipoprotein, low density lipoprotein, CRP (C-Reactive protein), IL-6, systolic blood pressure, diastolic blood pressure, and meridian energy.