Objective To investigate the incidence and the factors related to male senile osteoporosiswith dual energy X - ray ahsorptiometry (DEXA). Methods 139 cases of healthy elderly men were examined by WHO T - Score with DEXA to estimate the incidence of male senile osteoporosis. The relationshipbetween osteoporosis and various parameters such as age, body weight, smoking etc. was assessed. The resultsof DEXA examination were compared with those of plain X - ray film of lateral view of lumbar spine, hip Singhindex etc. Bone turnover markers were examined to study their relationship with osteoporosis by DEXA. Results The incidence of male senile osteoporosis was 26. 6%. Body weight and smoking were closely relatedto osteoporosis. No signifieant relationship was found between bone turnover markers and osteoporosis. PlainX - ray film of lumbar spine and hip Singh index bore a relationship with osteoporosis by DEXA. ConclusionIncidence of male senile osteoporosis is rather high, and it is imper'tant to pay more attention to the preventionand treatment of male senile osteoporosis. DEXA equipment is not popular in general hospital, therefore theplain X - ray film of lumbar spine and hip Singh index were found to have some value for the diagnosis of senileosteoporosis.