Cubital tunnel syndrome (CuTS)is one of the most common peripheral nerve entrapment diseases, which incidence rate is second only to carpal tunnel syndrome. Electromyography plays a key role in disease diagnosis. High frequency ultrasound and MRI make the diagnosis more accurate. Conservative treatment is effective in patients with early and mild symptoms. For patients with conservative failure or surgical indications, the effect of early operation is better than delayed operation. Although the curative effect of surgery is accurate, most severe cases have residual symptoms, and the best operation method is controversial. With the progress of applied anatomy and the summary of clinical experience, its surgical methods are constantly improved. At the same time, the application of microscope and endoscope in the treatment of cubital tunnel syndrome is becoming more and more mature. Paying attention to minimally invasive treatment, reducing complications and standardizing the diagnosis and treatment of cubital tunnel syndrome has gradually become the focus of research.