The purpose of this study is to evaluate the appropriateness of emergency admission of cancer patients and to make a policy of emergency department for diagnosing and treating of cancer patients.This study was undertaken of all cancer patients who visited during period from Jan. 1. 2007 to Dec. 31. 2008. ER records were reviewed retrospectively and ER doctor evaluated patients reason for appropriateness of emergency admission. 303 cancer patients were admitted via emergency department. 273 patients were visited by the will of patients or guardians 21 patients were transferred by the other hospital and 9 patients were referred from outpatients department. 224 patients were received the drug for pain control. Most common complaints were pain(30.4%), dyspnea(11.9%), general weakness(9.6%), fever(8.6%), mental change(7.3%), hemorrhage(5.3%), vomiting(4.3%), dysuria(3.D%), abdominal distension(2.0%). 284 patients were evaluated as appropriate. Below the age 50 and male patients referred by outpatient department were considered as statistically significant.(P=0.016)303 cancer patients visited to emergency department of Jeju National University Hospital complained pain, dyspnea, general weakness and 224 patients were received pain killer. Appropriateness of emergency admission were high but admissions in case of young age(below 50) and male patients referred by outpatients department were inappropriate.