Dystonia is examined, mainly by means of unarmed dystonia testing. The state of the patient’s dystonia is determined according to the dystonia grading criteria. The dystonia test is for the evaluation of dystonia caused by central nervous system lesions. Generally, the joints of the limbs can be passively moved in an unarmed manner, so as to determine the status of local dystonia. 1. If the patient’s joints are very floppy with passive movement, or there is no resistance, and there is hyperextension, it is considered that there is a decrease in muscle tone, which is common in peripheral nerve, gray matter of the anterior horn of the spinal cord and cerebellar lesions. 2. If passive activities are difficult and local muscle resistance occurs, it means that there is an increase in muscle tone, which is common in cerebrovascular disease or spinal cord disease. It is recommended that the patient under the guidance of a professional doctor for muscle tone examination, and during the examination, the patient should relax the muscles, do not subjective control, in order to obtain the most accurate test results.