| This paper introduces the classification of sights as well as the present situation and developing trend . In view of the vehicular operating requirements, which was designed to built-in the machine-gun turret as a variable-power telescopic sight. This sight has exchange characteristic at 1.2~×with 3~×, in order that shooters search for target in WFOV(small magnification),accurate aiming in NFOV(big magnification).In this paper, several ways of variable-power were analyzed in detail. After comparison of different methods, obtained the moveable really lens group to realize variable-power as the best solution, namely, using the principle of exchange object and image. The following this sight is elaborated with emphasis on calculation of overall dimensions of optical system, structural design of spare parts, analyses of error and precision, and experimental confirmation.In order to guarantee the drive system designed successfully for the first time, using the Pro Wildfire 3.0 design software for modeling, assembly simulation and movement simulation, to obtain the movement analysis chart and the result data; using ANSYS Workbench analyzes for the stress-strain of reverse gear in gear cluster, to obtain the stress-strain analysis chart.
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