Abstract: This paper deals with the significance of the chronoclock in gynecology.Using midnight-noon ebb-flow and qi-conducting theories,the author enunciates physiological and pathological relationship between the changes in the Taiji chronoclock and the rhythm of the biological clock in the human body,emphasized the importance of taking drugs according to time factors and believes that the saying of "taking yang drugs at yang period and taking yin drugs at yin period" has its theoretical basis.