Objective: to inquire into the diagnosis standard of the children hypertension and provide scientifically evidence for prevention children hypertension.

Objective To explore color Doppler flow imaging (CDFI) value in the diagnosis and quantitive analysis of renal artery stenosis (RAS) in patients of hypertension of renal vessel.

The diagnostic standard of medium and low risk hypertension shall be in accordance with the hypertension standard suggested in the "hypertension Prevention and Cure Guideline of China".