Parallax adjustment is still playing a very difficult part in stereoscopic shooting, because each factor changes, such as baseline, convergence, view angle, would change the perceptual distances of the whole image. In this paper, we estimated the effect about these factors in stereoscopic shooting, and proposed a parallax adjustment method for active stereo camera system. The proposed method can provide the optimal baseline and convergence value by feedback calculation in the following cases. 1. Specified parallax range of the scene. 2. Specified perceptual distances of a given object. We implement the method on an active stereo camera system. With this system, users can pay their attention on the stereo effect, the baseline and convergence will be real-time controlled automatically to achieve the stereo effect which users want to obtain. We evaluated the method in natural environment, and it is shown that the specified stereo effect can be obtained faster and more accurate.