With the recent development of real time technology, ultrasound is now uniquely well suited for the detection of abdominal abscess. The high accuracy of ultrasound in detecting abdominal abscess has been widely documented, also. The typical ultrasound appearance of an abscess is that of a fluid collection with diffuse, weak internal echos, representing the internal contents. Authors analyzed echogenicity and regularity of the abscesses in surgically and pathologically confirmed intra-abdominal abscesses, 38 cases except intra-abdominal organ abscesses. 1. 38 cases consist of 30 intra-abdominal abscesses, 4 pelvic abscesses, 4 retroperitioneal abscesses. 2. Numbers of the abscesses are 32 single and 6 multiful. 3. Echgenicity consist of 9 cystic, 14 semisolid, 6 solid, 9 mixed. 4. Mean size of abscess is 6$ imes$5 cm in single, but not measureable in multiful. 5. Abscess wall have relatively irregular inner wall(28 cases) and relatively regular outer wall(21 cases) in our cases. Con equently, echogenicity of the abscess is variable. But, relatively semisolid. Abscess have relatively irregular inner wall and relatively regular outer wall on ultrasonogram.