The purpose of this study was to collect blood samples of hypertensive patients, in order to clarify the correlation between serum miR-455-5p level and cardiac function. Generally, by using q-PCR assay, miR-455-5p level of each participants will be collected. Besides, SBP, DBP, LVPWd, LVIDd, IVSTd was detected by echocardiography and EF, FS, LVMi, RWT level was further calculated by LVIDd, LVPWd and IVSTd. Finally, the correlation of miR-455-5p level of HHD patients and LVPWd, LVIDd, IVSTd, EF, FS, LVMi, RWT, SBP, DBP was analysed.