In accordance with the particularity of space-borne environment and design demand of tracking system,tracking accuracy of space-borne tracking electro-optical tracking system is analyzed qualitatively and expatiated.On the basis of theoretical analysis of these,in the paper,tracking accuracy of a tracking system project is analyzed quantificationally,and an applicable method of improving system tracking accuracy is given.Finally,experimentation proves that stabilized tracking technology mentioned above meet the requirement of the system tracking accuracy target.