Seventy-seven cases of metastatic bone tumors are analysed, which has been confirmed by operation or biopsy atSeverance Hospital, Yonsei University College of Medicine. The results are follows ; 1. Primary site of metastaticbone tumor : Bony metastasis from carcinoma of gastrointestinal tract was most frequent and 17 cases(22.1%). Amongthem, stomach cancer was 10 cases(13.0%), hepatoma 6 cases(7.8%) and esophageal cancer 1 case(1.3%). Second orderof metastasis was lung and uterine cervical cancer and each was 8 cases(10.4%). And then metastasis from breastcancer was 6 cases(7.8%) 2. Frequently involved skeletons of metastatic site : Breast, stomach, prostate anduterine cervical cancer were more frequently metastasized to axial skeletons such as spines, pelvis and ribs. Andlung cancer and hepatoma were more frequently to skull, femur and rib. 3. Type of metastasis in radiographicclassification ; The order of frequency which showed osteoblastic or mixed type of metastasis was stomach (5cases, 35.7%) breast (3 cases, 21.4%) prostate (2 cases, 14.3%) lung (2 cases, 14.3%) melanoma (1 case, 7.1%) andbladder (1 case, 7.1%) cancer. The order of metastasis which showed osteolytic one was cervix (8 cases, 28.6%),lung (6 cases, 21.4%), stomach (5 cases, 17.9%), skin (4 cases, 14.3%), breast (3 cases, 10.7%), kidney (1 case,3.55%) cancers and melanoma (1 case, 3.55%). Among them, cervix, liver, skin and renal cancer were purelyosteolytic type. 4. Radiographic findings in detail of analysis : Most of frequent radiographic features ofmetastatic bone tumor was diffuse scattering, mottled and ill-defined bony rarefaction. Those showed solitarylocalized osteolytic lesion sere metastasis frm cervix (2 cases), bladder (1 case), liver (1 case) and lung (1 case) cancer in decreasing order of frequency. Those showed multiple localized osteolytic lesion were metastasisfrom liver(caseses), cervix(3 cases), skin(2 cases), breast(2 cases), lung (1 case) and bladder (1 case) cancer.These analysis were only included by radiographically and pathologically proven cases. There should be moreexpected cases being included, if routine bne surveys hould be done for cancer patient with conjunction of provenin autopsy. Screening bone scanning, using radioisotope is more recommended for the early detection of metastaticlesion which was unable to detect on plain X-ray film.