Appendicitis is one of the most common condition causing an acute abdomen in young adult population. Two hundreds and fifty-nine cases of acute appendicitis provened by surgery and pathology during recent 2 years in Han-ll Hospital were studied and analyzed by preoperative plain abdominal X-Ray. One case of barium enema was also done. The results were as follows: 1. Male to female sex ratio was 1:1. 2. In age distribution, the most common age group was from two to four decade.(75.35) 3. The most common clinical symptom was classical abdominal pain as 86.5%. 4. The positive radiographic findings were obtained 75.7% of all cases. 5. Common radiographic findings as follows: 1) Reflex ileus on RLQ (73.7%) 2) Obliteration of Rt. psoas line (41.3%) 3) Scoliosis of lumbar spine (21.2%) 6. The most common site of appendix was retrocecal I position. (84.2%) 7. One case of appendicolith and one case of appendiceal diverticulum were demonstrated.