Inclusion Criteria:

For inclusion in the study patients must fulfill all of the following criteria:

1. Provision of written informed consent by patient or his/her legal guardian
2. Hospitalized for a diagnosis of Schizophrenia paranoid subtype by Diagnostic and Statistical Manual of Mental Disorders- Fourth Edition (DSM-IV)
3. PANSS total score≥60
4. Female patients of childbearing potential must be using a reliable method of contraception and have a negative urine human chronic gonadotropin (HCG) test at enrolment
5. Able to understand and comply with the requirements of the study

Exclusion Criteria:

Any of the following is regarded as a criterion for exclusion from the study:

1. Pregnancy or lactation
2. Any DSM-IV Axis I disorder not defined in the inclusion criteria
3. Patients who, in the opinion of the investigator, pose an imminent risk of suicide or a danger to self or others
4. Known intolerance or lack of response to quetiapine fumarate or/and haloperidol, as judged by the investigator
5. Use of any of the following cytochrome P450 3A4 inhibitors in the 14 days preceding enrolment including but not limited to: ketoconazole, itraconazole, fluconazole, erythromycin, clarithromycin, troleandomycin, indinavir, nelfinavir, ritonavir, fluvoxamine and saquinavir
6. Use of any of the following cytochrome P450 3A4 inducers in the 14 days preceding enrolment including but not limited to: phenytoin, carbamazepine, barbiturates, rifampin, St. John's Wort, and glucocorticoids
7. Administration of a depot antipsychotic injection within one dosing interval (for the depot) before randomisation
8. Substance or alcohol dependence at enrolment (except dependence in full remission, and except for caffeine or nicotine dependence), as defined by DSM-IV criteria
9. Opiates, amphetamine, barbiturate, cocaine, cannabis, or hallucinogen abuse by DSM-IV criteria within 4 weeks prior to enrolment
10. Medical conditions that would affect absorption, distribution, metabolism, or excretion of study treatment
11. Unstable or inadequately treated medical illness (e.g. congestive heart failure, angina pectoris, hypertension) as judged by the investigator
12. Organic changes was founded by brain CT
13. Involvement in the planning and conduct of the study
14. Previous enrolment or randomisation of treatment in the present study.
15. Participation in another drug trial within 4 weeks prior enrolment into this study or longer in accordance with local requirements
16. A patient with Diabetes Mellitus (DM) fulfilling one of the following criteria: unstable DM defined as enrolment glycosylated hemoglobin (HbA1c) >8.5%; admitted to hospital for treatment of DM or DM related illness in past 12 weeks; not under physician care for DM Physician responsible for patient's DM care has not indicated that patient's DM is controlled; Physician responsible for patient's DM care has not approved patient's participation in the study; has not been on the same dose of oral hypoglycaemic drug(s) and/or diet for the 4 weeks prior to randomisation; for thiazolidinediones (glitazones) this period should not be less than 8 Weeks; taking insulin whose daily dose on one occasion in the past 4 weeks has been more than 10% above or below their mean dose in the preceding 4 weeks. Note: If a diabetic patient meets one of these criteria, the patient is to be excluded even if the treating physician believes that the patient is stable and can participate in the study.
17. An absolute neutrophil count (ANC) of 1.5 x 109/L
18. Sleep disorder such as Apnea Hypopneas Syndrome, PLMS and narcolepsy
19. The work time is rotate and/or often flies across the time zone
20. Use of clozapine within 28 days prior to randomization