Nowadays

implantation failure is still a problem to be solved urgently in the application of assisted reproductive technology. Endometrial receptivity represents the role of the endometrium during the implantation window. Endometrium proliferation

secretion transformation is determined by preserving and discharging functions of the uterus. As a subtle substance directly related to reproduction

Tiangui changes with the growth and decline of kidney qi

and is involved in regulating the preserving and discharging functions of the uterus. At the same time

the endometrial receptivity is affected by changes in blood and qi in the uterus. All of these are under the control of the kidney. Kidney deficiency and vascular obstruction of uterine collaterals can affect uterine function

which leads to low endometrial receptivity. Therefore

the method of supplementing the kidney and invigorating blood

removing stasis and clearing collaterals is commonly used for the condition. The types of symptoms should be distinguished in clinical application. The deficiency syndrome is mainly to be treated by tonifying the kidney

while the blood stasis syndrome is mainly to invigorating blood and remove stasis.