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Deep brain stimulation (DBS) is a effective treatment method for patients with Parkinson's disease (PD). In this study, a quantitative evaluation for the availability of DBS operation to PD patients were done by use of a visual tracking test. Visual target with random trajectory was adopted and the hand movement of three PD patients were recorded in the state before and after surgery. Parameters related to the tremor, rigidity, akinesia and so on were calculated and the effect of DBS operation was quantitatively evaluated. Remarkable improvement was validated through the parameters. In addition to the above analysis, comparison of the motor function between PD patients and normal healthy person was also investigated.