During four years, we had an opportunity to follow over 200 pulmonary metastasis cases but the report is restricted to 81 cases that have been regarded as having satisfactory histological proof of the primary malignant tumor. For presentation, cases have been arbitrarily aranged in 5 groups to facilitate consideration of various pulmonary metastatic neoplasm. The percentage distrivution of lung metastasis and age incidence were also reviewed. 1. All 81 cases confirmed by biopsy and showed coarse nodular type pulmonary metastasis in 47.3%, lympathic type metastasis in 34.6%, golf type pulmonary metasiasis in 8.6 %, miliary type pulmonary metastasis in 6.2% and pneumonic type puilmonary metastasis in 3.7%. 2. 95% of hepatoma cases showed coarse nodular type metastasis to the lung and 5% of cases of hepatoma showed miliary type pulmonary metastasis. 3. In 81 cases of pulmonary metastasis fromprimary malignant tumor, age incidence and frequency of pulmonary metastasis were demonstrated on the table 1.