影响输电线路不平衡张力大小的因素有很多，单就微地形来讲，主要是指大档距、大高差和大小档。单个微地形因素一般不会对输电线路造成破坏性影响，多种因素组合可能影响输电线路安全运行。通过对输电线路中可能存在的各种微地形因素进行组合，利用输电线路不平衡张力计算软件，对各种微地形下的不平衡张力进行计算，总结出微地形对输电线路不平衡张力大小影响的规律，可为输电线路设计和改造提供参考。

There are many factors impacting the unbalanced tensile force of the transmission line. To the micro-terrain, the factors including long-span, big altitude difference and large distance difference. Generally speaking, single factor from micro-terrain will not have destructive impact on the transmission line, while the combination of various factors does. In this paper, all possible factors of micro-terrain are assembled, the computation software for unbalanced tensile force is applied and the computation results are achieved for all possible cases. The impact pattern are summarized which can be referenced for future transmission line design and transforming.