This paper presented a Arx. Net secondary development technology method combining with AutoCAD accurately computation of space pre-stressed extension amount, elaborated the method calculation of single end tension, double end tension, straight beam and curved beam space pre-stressed extension amount application of the method, to supply reference for pre-stressed extension amount calculation.%提出了一种结合AutoCAD中的Arx. Net二次开发技术精确计算空间预应力束引伸量的方法，阐述了应用该方法计算单端张拉、双端张拉以及直线梁和曲线梁空间预应力束引伸量的方法，以供求解预应力引伸量参考借鉴。
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