Chest impediment is a disease characterized by clinical symptoms of paroxysmal suffocation and pain around danzhong(CV17)or chest.The Chapter On Pulse Syndrome Complex and Treatment of Chest Impediment，Heart Pain and Shortness of Qi inJingui Yaolyehad proposed the theory of weak pulse at yang and wiry pulse at yin，specifically，deficiency and debilitation of chest yang，yin-cold and internal excess，yin invasion of yang，impediment obstructing chest yang，and using yang-unblocking and impediment-diffusing method to unblock heart yang and eliminate pathogenic impediment.Starting with the theory of weak pulse at yang and wiry pulse at yin，this paper further analyzed the yang-unblocking and impediment-diffusing method and its exertion，and realized ZHANG Zhongjing's thought of"one syndrome involved and then adding one medicine".