Objective <p>To evaluate the effects of acupuncture combined with indirect moxibustion at the navel on maximum follicular diameter and high-temperature phase score (HPS) in patients with inadequate luteal function infertility.</p> Methods <p>A total of 180 patients with inadequate luteal function infertility were randomly divided into an acupuncture group and an acupuncture-moxibustion group using the random number table method, with 90 cases in each group. Both groups received oral progesterone capsules. Patients in the acupuncture group were treated with acupuncture at abdominal points, starting on day 5 of the menstrual cycle, administered 2–3 times weekly until the onset of the next menstrual period, for a total of 3 menstrual cycles. Patients in the acupuncture-moxibustion group were treated with indirect moxibustion at the navel in addition to the intervention in the acupuncture group, administered once weekly on days when acupuncture treatment was not performed, for a continuous treatment for 3 menstrual cycles. The clinical efficacy was compared, and changes in the traditional Chinese medicine (TCM) symptom score, endometrial thickness, maximum follicular diameter, HPS, and pregnancy rate were observed after treatment.</p> Results <p>After treatment, the total TCM symptom score of the acupuncture-moxibustion group was lower than that of the acupuncture group (<i>P</i>&lt;0.05). The levels of serum estradiol, progesterone, and luteinizing hormone, and endometrial thickness, maximum follicle diameter, and HPS score were higher in the acupuncture-moxibustion group than in the acupuncture group (<i>P</i>&lt;0.05). The pregnancy rate was 44.4% in the acupuncture-moxibustion group versus 15.6% in the acupuncture group (<i>P</i>&lt;0.05). No severe adverse reactions occurred in either group during treatment.</p> Conclusion <p>In addition to progesterone therapy, the efficacy of abdominal acupuncture combined with indirect moxibustion at the navel in the treatment of inadequate luteal function infertility is better than that of abdominal acupuncture alone; this combined method is more effective in improving progesterone levels, increasing follicular diameter and endometrial thickness, and enhancing HPS and pregnancy rate.</p>