We employed the Meridian Test to study the effects of acupuncture on m otor organ diseases and medical expenses of workers in a company, where health promotion is a priority. Our two-month trial was done at one factory which employs mainly physical labor workers. Acupuncture treatments were given for pain in the neckshoulder, knee and lumbar regions. After 8 weeks of our treatment, 83% of neck-shoulder pain cases, 77% of lumbar pain cases, and 88% of knee pain cases reported that their pain was reduced more than 50%. The results of a mental test (POMS test) showed a significant decrease in tension, depression, anger, fatigue and mental confusion. In terms of acupuncture treatment, numbers of visits to conventional hospitals were significantly decreased and average medical expenses were reduced to about 30%. These reductions continued for the next 3 months. Acupuncture treatment using the Meridian Test could benefit corporations where health promotion of workers is an urgent priority.