Phase 3 Study of A Group A, C Polysaccharide Meningococcal and Type b Haemophilus Influenzal Conjugate Vaccine

Inclusion Criteria: * Healthy subjects aged 3 to 5 months, normal intelligence. * The subjects' guardians are able to understand and sign the informed consent. * Healthy subjects confirmed by medical history questioning, physical examination and clinical decision and in accordance with vaccination requirements of the investigational vaccine. * Subjects who can comply with the requirements of the clinical trial program according to the researcher's views. * Subjects who have never received group A, C polysaccharide meningococcal vaccine and type b haemophilus Influenzal vaccine. * Subjects with temperature\<=37°C on axillary setting. Exclusion Criteria for the first vaccination: * Subject who has a medical history of Meningitis; * Subject who has a medical history of any of the following: allergies, seizures, epilepsy, encephalopathy history and so on; * Subject who is allergic with tetanus toxoid components; * Subject suffering from thrombocytopenia or other coagulation disorder may lead to contraindication to intramuscular injection; * Subject who has a history of allergic reactions; * Any known immunological dysfunction; * Had received gamma globulin or immune globulin, in the past two weeks * Bleeding disorder diagnosed by a doctor or significant bruising or bleeding difficulties with IM injections or blood draws * Any acute infections in last 7 days * Any prior administration of immunodepressant or corticosteroids in last 6month * Any prior administration of other research medicines in last 1 month * Any prior administration of attenuated live vaccine in last 28 days * Any prior administration of subunit or inactivated vaccines in last 14 days, such as pneumococcal vaccine * Subject suffering from congenital malformations, developmental delay or serious chronic disease; * Any acute infections * Any condition that in the opinion of the investigator, may interfere with the evaluation of study objectives Exclusion Criteria for the second or third vaccination: * Had any Grade 3 or Grade 4 adverse reactions or events associated with investigational vaccine occurred since the vaccination * Any situation meets the exclusion criteria for first dose; * Any condition the investigator believed may affect the evaluation of the vaccine.