Objective: The subject aims to study on relationship between clinical, nasal endoscopy and CT-Scan on chronic rhinosinusitis patients. Patients and method: 32 patients diagnosed chronic rhinosinusitis. Results: Compare between clinical, endoscopy and CT-Scan, the authors see that nasal obstruction patients have 53,125 percent nasal septal devivation, polyp 47,525 percent, middle turbinate intestice 56,25 percent and musco nasal 50 percent . Decrease or lose smell with nasal polyp is 34,375 percent and 100 percent patients have runny nose inclue in middle turbinate intestice 37, 5 percent. Sense of pressure in forehead of face with nasal septal devivation is 59,375 percent, nasal polyp is 40,425 percent and middle turbinate intestice is 62,5 percent. Runny nose with nasal septal devivation is 62,5 percent, nasal polyp is 53,025 percent and middle turbinate intestice is 71,875 percent. Conclusions: Have clearly relationship between clinical with nasal endoscopy and CT-Scan rhinosinus. Nasal endoscopy is more exactly than clinical. The level of disease on CT-Scan is higher on nasal endoscopy and clinical. Especially, nasal CT-Scan show many images that abnormal anatomys, obtraction of OMC and diseases of mucus membrance of sinus on nasal endoscopy do not explain to clinical.