The Omentum is the largest peritoneal fold in human body, often involved by other parts disease, its clinical manifestations lack of specificity, a clear diagnosis is helpful to make the next diagnosis and treatment plan. As a simple, noninvasive and effective method, ultrasound can be used as the first choice of imaging examination for omental lesions. With the application of ultrasonic elastography, it has higher sensitivity and specificity in the preoperative diagnosis of omental lesions.The definite diagnosis of omental disease depends on pathological examination. Ultrasound guided biopsy of omentum is a minimally invasive and efficient method for obtaining specimens, which can be used as the first choice for obtaining pathological tissues. This paper reviews the application of conventional ultrasound and elastography in omental diseases.