Sialography, the roentgen visualization of the salivary gland after injection of contrast material into their respective ducts, has made an advance in the study of diseases affecting these organs and adjcent structures. Authors present 35 cases of sialogrpahy done at the Department of Radiology, Seoul National University, between 1979 and 1980. Authors analyzed the radiologic, clinical, operative and pathologic findings. The results are as follows : 1. Among 11 cases of salivary gland tumors, 8 cases were arisen from parotid gland, 3 cases from submandibular gland. Malignant tumors were differentiated from benign tumor by the absence of ductal and parenchymal destructive changes. 2. Among the cass fo sialodocholithiasis, 7 cases were in the submanidibular gland. They could be easily diagnosed by the filling defect in the duct and secondary inflammatory changes in including proximal dilatation, beading of the duct and sialodochiectasis. 3. A case of Sjoegren syndrome shows pu ctate and globular dilatoation of minute ductules of small ductal branches and delayed evacuation sugeting decreased sailvary secretion. 4. Sialography is a safe and important roentgenologic examination of salivary glands which gives a helpful information in accuration diagnosis and appropriate thereapeutic planning.