PURPOSE: We studied the co-relation on the causes of the hip fracture through the analysis of a relevance on the etiological factors as increased incidence according increasing old ages. MATERIALS AND METHODS: Total 158 cases that treated on the hip fracture from 2001 Jan. to 2002 May were studied. The parameters were age, gender, smoking, obesity, type of fracture, place of fracture, other comorbidity, activity of daily living, bone marrow densitometry, hardness of floor, orientation, injury energy. And then, we analysis of difference between femur neck fracture and femur intretrochanter fracture and between stable femur intertrochanter fracture and unstable femur intertrochanter fracture. RESULTS: The incidence of the femoral intertrochanteric fracture was larger significantly than that of the femoral neck fracture in the older than 80(p < 0.001). On the comparison of the pre-fractural activity of daily living, the group revealed lower activity had larger incidence of femoral intertrochateric fracture(p < 0.001). Also, the femoral intertrochanteric fracture was more larger in osteoporosis patient group(p < 0.005), and lower energy trauma(P<0.05). In a unstable femoral intertrochanteric fracture, 21 cases(77.7%) of total 27 cases were belong to the group of the activity of daily living scale below C(p < 0.05), 24 cases of 27 cases were belong to the osteoporosis patient who was estimated below -3.0 on T-score(p < 0.001). CONCLUSION: In the hip fracture of the elderly patients, the femoral intertrochanteric fracture is more prevalance rather than the femoral neck fracture on the cases of older patient more than 80 year-old, lower activity of daily living scale, lower T-score less than -3.0 on BMD, lower energy trauma. Also, in femur intertrochanter fracture, unstable fracture is more common in low daily activity and osteoporosis