Evaluate the Safety and Effectiveness of Various Frequency Stimulation for Patients With Parkinson's Disease

Patients with an implantable electrical nerve stimulation system Patient criteria included: over 18 years of age,MMSE≥ 24 score; H-Y stage in medicine off condition\>2.0;an ability to walk at least 10 meters independently;subscore≥2 for UPDRS part II item 15;subscore \>1 for UPDRS part II item 14; permissions given by informed consent. Patients with serious diseases such as tumor, sever liver or kidney dysfunction were not selected in the clinical trials. Subjects participating in other clinical trials related or not related to these trials were not chosen.