Safety and Efficacy of SPH3127 on Treating Mild-moderate Essential Hypertension Patients

This is a dose finding trial. Totally 120 mild-moderate essential hypertension patients will be enrolled. All the patients will be randomized (1:1:1:1) into four groups (SPH3127 50mg, SPH3127 100mg, SPH3127 200mg and placebo). The trial has three phases: the screening phase, the leading phase and the treating phase. The primary endpoints are the changes of DBP and SBP compared to the baseline after 8 weeks of treatment. All the adverse events are required to be collected for safety analyzing.