To evaluate the reliability of the Qualisys 3D motion analysis system, one test subject’s gait was recorded (Ntotal=24) by eight high-speed cameras. Markers were used for tracking the movements (TrackManager by Qualisys) and together with force plate data was analyzed with 3D-analysis software (Visual 3D basic by C-Motion). Examined parameters were joint angles for both legs, and moments and powers for the right leg. These parameters were examined in the sagittal (X), frontal (Y) and the transverse (Z) plane. Another criterion was the targets direction of approach (coming from negative and positive y-direction). Although most of the resulting data appears to be consistent, a higher level of noise was noticed for the moment and power signals on the second force plate, when the target approached from the positive y-direction. Another source for imprecise data is the array of the cameras. At least one camera’s field of view was inhibited by an obstacle and all of them were placed on the same transverse plane. Fields for further research could be experimentation with camera arrays and increasing the sample size significantly, to justify the expedient use of statistics for further analysis.