Low menstrual flow is recommended to be regulated clinically by taking Yimoucao capsules. If the menstrual flow does not improve after two consecutive menstrual cycles, it is recommended to do the appropriate tests to rule out the following diseases: the first one is to do ultrasound to rule out bilateral ovarian polycystic changes. The second one is to take blood test for sex hormone six and thyroid function on the second day of menstruation to understand the endocrine situation and to exclude low menstrual flow due to increased prolactin and low menstrual flow due to polycystic ovary syndrome caused by increased androgens in clinical practice. It is also possible to exclude the decrease in menstrual flow caused by premature ovarian failure. It is recommended to eat more foods containing phytoestrogens, such as fresh soy milk, royal jelly, onions, peanut butter, etc. to supplement estrogen, which may also increase menstrual flow to some extent.