The trenchless technology has been widely used for national gas pipelines to cross obstacles such as lakes, railways, highways and buildings. The trenchless way includes the horizontal directional drilling crossing, the shield crossing, and the top pipe crossing and so on. Taking the engineering in which the DN700 pipeline crosses South-to-North Water Transfer project, the paper introduces the concrete design scheme of drilling crossing.%天然气长输管道通常需要采用非开挖的方式穿越湖泊、河流、铁路、高速公路、建筑物等各种障碍物。非开挖的方式主要有水平定向钻穿越、盾构穿越、顶管穿越等。文章以某段 DN700高压输气管道穿越南水北调工程为例，介绍了水平定向钻技术的具体设计方案。
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