B.Treatment phase (V2~V3; 2~4 Week finished; 14±3~28±3 Day finished) The vital sign, physical examination, BMI, laboratory tests (at V3), PANSS, EPS (AIMS & BARS), menstrual function, sexual function (Arizona sexual experience scale), and prolactin will be carried out. Concomitant medication, adverse events, and drug accounting will also be recorded at this visit. Study drug could be titrated with a flexible dose from 7.5 to 30 mg QD. All dose adjustments should be made with the approval of the investigator.