胎动不安是妇科常见病之一，若治疗不及时或用药不恰当，可能导致母胎俱损。导致胎动不安的病因复杂，证型多变，治法也较多。临床多以补肾为主，辅以益气养血清热等。脾胃为气血生化之源，亦为气机升降之枢纽，而气能载胎，血能养胎，因此脾胃的生理功能对于胎儿长养至关重要。健脾法是郑惠芳学术思想的精髓。在保胎用药时，常以补脾益气、滋补化源为治疗大法，不忘益气摄血、升阳举陷。同时注意脾与其他脏腑的关系，益肾以固胎元，和胃以助纳运，养心以主血。主要论述脾旺胎长的理论基础、胎动不安患者脾虚的病因病机以及郑惠芳健脾法具体应用，并附验案一则以资佐证。

Threatened abortion is one of the common gynecological diseases. If there is no immediate or appropriate treatment,it may affect both the mother and fetus. The causes are various and the syndrome types are varied,and therefore there are many treatment methods. In clinic,tonifying kidney is the major method,supplemented by replenishing qi,nourishing blood and clearing heat. Spleen and stomach are the source for the generation of qi and blood,and also serve as the pivot for qi's ascending and descending. Qi could carry the fetus and blood could nourish the fetus. Therefore,the physiological functions of spleen and stomach are very important for fetal growth. Invigorating spleen is the essence of ZHENG Huifang's academic thought. When using medicinals for rescuing fetus,she often used tonifying spleen and replenishing qi,nourishing the origin as the major principles,also the methods of replenishing qi and consolidating blood,and elevating yang and raising the drooping were applied. Besides,she also paid attention to the relationship between the spleen and other viscera,for example,replenishing kidney to consolidate fetus,harmonizing stomach to promote digestion,and nourishing heart to govern blood. In this paper the theoretical basis of strong spleen and fetus growth,the disease cause and disease mechanism of threatened abortion,and the application of invigorating spleen method by Professor ZHENG Huifang are discussed. There is a proved case cited in this paper.