To observe the diagnosis and treatment combine with Alisma The Decoction side antihypertensive effect in patients with hypertension，clear that such treatment is more suitable for the circumstances of hypertension. Methods:Selected patients with primary hypertension in 140 cases were randomly divided into two groups，one group was given the diagnosis and treatment side，the other group was given the diagnosis and treatment side combine with Alismataceae Decoction side，oral therapy，course of treatment is 28 days，observing the different stages of casual blood pressure. Results: Two groups of casual blood pressure before treatment were significantly decreased ( P<0.01) . Among them，the observation group and the control group compared SBP on the fourteenth day、the twenty-first day and the twenty-eighth day are of difference ( P<0.05 or P<0.01)，DBP earlier on the twenty-first day and the twenty-eighth day are of difference ( P<0.05 or P<0.01).The observation group and the control group with the same history between groups twenty-eighth days earlier，less than five years of history，five years of history group is less than ten years between group SBP，DBP were no difference ( P>0.05)，ten years less than or equal to fifteen years group， fifteen years between group SBP，DBP showed difference ( P<0.05 or P<0.01)，with a history extending its difference and more significantly；the observation group and the control group with the same syndrome between groups twenty-eighth days earlier：the SBP and DBP of anger hyperactivity permit was of no difference ( P>0.05)，the SBP is of no difference ( P>0.05) and DBP is different ( P<0.05) of syndrome of hyperactivity of Yang due to Yin deficiency，the SBP of DBP are of differences ( P<0.05 or P<0.01) of phlegm dampness card and deficiency of both Yin and Yang.Conclusion:The diagnosis and treatment combine with Alisma The Decoction side has a better antihypertensive effect than a simple diagnosis and treatment，especially suitable for the history long、TCM syndrome of phlegm dampness card syndrome of deficiency of both Yin and Yang in hypertensive patients.