Objective To observe the therapeutic effect of umbilicus moxibustion for sub-health people with yang-deficiency constitution.Methods Sixty sub-health volunteers with yang-deficiency constitution were equally and randomly divided into treatment and control groups.The subjects of the two groups were treated conventionally with Jingui Shenqi Pill(Goldern Chamber Pill for strengthening the Kidney-qi)

8 pills each time

3 times a day.Additionally

those subjects of the treatment group were also treated by moxibustion over the umbilicus

twice a week

3 months altogether.The integrative score was assessed before and after the treatment in accordance with the criteria of "Quantization Diagnosis of Chinese Medicine".Results After umbilicus moxibustion intervention for 3 months

the integrative scores of symptoms of mental fatigue

cold limbs and warmth preference

lassitude in loin and limbs

and loose stool were decreased significantly in the treatment group(P<0.05)

suggesting an improvement of these symptoms and being superior to those of the control group in the curative effect(P<0.05).Simple Jingui Shenqi Pill treatment was also effective in reducing scores of cold limbs and warmth preference

and lassitude in loin and legs after the treatment(P<0.05).Of the two 30 cases in the treatment and control groups

18(60.0%)and 7(23.3%)expe-rienced marked improvement in their symptoms

10(33.3%) and 12(40.0%) had an improvement

2(6.7%) and 11(36.7%) were failed

with the effective rates being 93.3% and 63.3%

respectively.Conclusion Umbilicus moxibustion therapy can effectively improve clinical symptoms of sub-health subjects with yang-deficiency constitution.