Study to Evaluate the Efficacy and Safety of SPH3127 In Patients With Mild-moderate Essential Hypertension

Inclusion Criteria: 1. Male or female of age ≥18 years; 2. Diagnosed with mild-moderate essential hypertension; 3. Participant has understood the study-required procedures, voluntarily signed informed consent. Exclusion Criteria: 1. Diagnosed with secondary hypertension, suspected grade 3 hypertension, acute hypertension, or at risk when current antihypertensive therapy discontinued; 2. Suffered by severe heart disease within 6 months; 3. Suffered by severe cerebrovascular disease within 6 months; 4. Suffered by severe or malignant retinopathy; 5. Out of controlled diabetes; 6. History of malignant tumor; 7. History of mental disorder; 8. Subject is planning or in use of other antihypertensive drugs or other drugs may affect blood pressure during the trial; 9. Alcohol or drug abuse; 10. Pregnant, lactating women or subject is planning to pregnant within 6 months after the trial; 11. Assessed by the investigators as unsuitable for participating in the study.