AIM:To investigate the clinical characters and causes of subconjunctival hemorrhage(SCH). METHODS: A total of 103 patients with SCH aged 0-83 years were studied. The conjunctiva was divided into 10 equal areas. The age, gender, medical history, ocular disease history and site of subconjunctival hemorrhage were determined for all subjects. RESULTS:The number of patients involved by SCH showed an age-related increase. The number of patients with SCH increased markedly in 41-50 years of age and 61-70 years of age(0-10 years:5 patients,11-20 years:5 patients,21-30 years:10 patients, 31-40 years:15 patients, 41-50 years:24 patients, 51-60 years:14 patients, 61-70 years:24 patients, 71-80 years:5 patients, and over 80 years:1patient). The number of patients with traumatic SCH was 18 patients(54.1%) in less than 40 years of age, the number of patients with SCH by hypertension was 17 patients(56.7%) after the age of 60 years. Overall SCH was significantly more common in the temporal areas than other areas (45.6%). However the temporal areas were affected more often in traumatic SCH (50.0%). Summer subconjunctival hemorrhage was in 43 patients (41.7%). CONCLUSION: SCH showed an age-related increase in extent and was predominant in the temporal areas. However traumatic SCH was usually detected as localized hemorrhage in the temporal areas. The peak season for SCH was summer in all age groups. The trauma is the main reason in the younger group(≤40 years), but hypertension was the major risk factor in the older group(＞60 years ).