Threatened abortion is a common gynecologic disease, and the traditional Chinese medicine belongs to the category of "fetal leakage", "restlessness of the fetus" and "slippery fetus". Its syndrome differentiation mainly includes kidney deficiency, blood heat, weakness of Qi and blood, and blood stasis, Professor ZHANG Ying-chun is the teacher of the sixth batch of academic inheritance of traditional Chinese medicine, she summarized her clinical experience for many years, consider that the causes of blood stasis after pregnancy include Yin deficiency, heat and blood stasis, Qi stagnation and blood stasis due to cold coagulation and blood stasis, etc., the RI value of uterine artery was monitored by B-mode ultrasound after pregnancy. Professor ZHANG Yingchun, on the basis of syndrome differentiation and treatment, treated the "blood stasis syndrome" of fetal leakage, restless fetal movement and systosis, examined the cause of syndrome, gave the measures of clearing away heat and cooling blood, nourishing Yin and blood, warming the uterus and dispersing cold, and so on, while keeping the fetus stable, she is flexible, proper application of blood-activating and stasis-removing drugs such as Angelica, Chuanxiong, Danshen, Panax Notoginseng, peach kernel, etc.