Objective]To explore clinical experience in treating pregnancy uterine cavity effusion by tonifying kidney to remove blood stasis. [Method] With the study of TCM literature on pregnancy uterine cavity effusion, by combining with clinical practice, it expounds pathogenesis and treatment of syndrome differentiation of pregnancy uterine cavity effusion. [Result]The main pathogenesis of this disease focuses on kidney deficiency and blood stasis which can impair Chong and Ren channels,inducing insecurity of the fetal origin,so the clinical treatment principle centers on tonifying kidney to remove blood stasis,and the self-decoction that is the basic recipe may change with symptom, making the fetal origin secure. [Conclusion] Method of tonifying kidney to remove blood stasis is quite effective for pregnancy uterine cavity effusion in clinic,and it is worth further study.