Carpal tunnel syndrome (CTS) is common and overlooked in clinical practice. Early diagnosis is important to treatment and is established by the clinical features and electrophysiological studies. Objectives: (1) To study the clinical features and electrophysiological parametters of the CTS and (2) to compare some clinical symptoms with some of electrophysiological index in these patients. Patients and Methods: 40 patients with as syndrome were selected by the criteria: (1) has at least one clinical symptom and (2) has at least one abnormal index of the as syndrome on the electrophysiological study throught method prospective study with comparison to controls. Results. Clinically, 80 percent patients have a numbness of lateral four fingers, 50 percent abductor pollicis brevis weakness, 7.5 percent amyotrophy and 72.5 percent have Tinel's sign and Phalen's test. Electrophysiologically, 87.5 percent have prolonged distal latency, 77.5 percent lower sensory nerve conduction, reduced amplitude sensory and motor order was 62.5 percent and 60 percent. The abnormalities is 87.5 percent on electrophysiological parametters and 80 percent on clinical features. No difference the paresthesia in the fingers (80 percent) with reduced sensory conduction (77.5 percent), but the