检测了杭州市17个小区共63根不同层高庭院引入管的连续管地电位，并对具有代表性的庭院引入管采用峰-谷用电时间段分别进行杂散电流检测。结果表明，在所检测的小区中，大部分庭院引入管上存在着杂散电流的影响，该影响因楼层高度不同有所差别。对存在较严重杂散电流的庭院引入管，可采用加装锌带牺牲阳极的方法进行防治，并且，该方法在庭院引入管上具有一定的排流效果。

The continuous pipe-to-soil potentials of 63 sticks of courtyard gas service pipes, built in 17 courtyards of Hangzhou, were detected. And then, the detection to the stray current of the typical courtyard gas service pipes was performed in peak and valley period of electric time, respectively. The results show that the influence caused by stray current existed on most of the courtyard gas service pipes in the tested courtyards. The influences were different for different storeys. For the courtyard gas service pipes with more stray current, the way of fixing zinc sacrificial anode was adopted to prevent the stray current. This method has some effect of stray current drainage.