A moving-target used for tracking accuracy test of the laser communication terminal was introduced in this paper. The rotary shaft sway of moving-target affected the motion characteristic of the moving-target and the test of tracking accuracy. So it was necessary to analyze the effect of the sway in the shaft of moving-target to its motion characteristic. Firstly, we established a mathematic model of the moving-target that we introduced in the front of paper, then analyzed the effect of the shaft sway of moving-target to moving-target's motion characteristic. The results indicated that the frequency of the sway and maximum value of the sway had a severe effect to the motion characteristic. So it was necessary to control the shaft sway when the moving-target was designed or manufactured.
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