中文摘要：

对同一回线和“8”字形回线进行实验对比研究。采用控制变量法对两种装置进行了多方面实验对比，并在同一实际工作区域运用同一回线扣“8”字形回线进行安地测量，分析数据质量，对比解释成果。比较二者在地面瞬变电磁勘探应用中的优劣。得到结论：1）“8”字形回线比同一回线有更好的信噪比。2）“8”字形回线装置在抗干扰能力优于同一回线装置，晚期信号的稳定性优于同一回线装置。3）关断时间相同的情况下，同一回线比“8”字形回线有更好的分辨能力，能获得更加丰富的浅层地质信息。4）在信号的灵敏度反应方面，“8”字形回线不如同一回线装置。5）在深大断裂构造或者目标体跟围岩电阻率差距较大的地区可以采用“8”字形回线。

英文摘要：

The transient electromagnetic method commonly used many kinds of loops, such as： single loop, overlapping loop,central loop, large loop and type of ＂8＂ loop. Many of these loops, a lot of literature have made it clear,and show some properties of them, For the type of ＂8＂ loop, literatures is not enough. In order to study the type of ＂8＂ loop and find the difference between the type of ＂8＂ loop and other loops, the author of this article compare the single loop and the type of ＂8＂ loop using the control variable method in the various experimental comparison. Using the single loop and the type of ＂8＂ loop to work in the same area field, then, analysis the data quality, contrasted the explanation. Compare the difference of this two kinds of loops and expounds the advantages and disadvantages of the two. Results show that, 1）the type of ＂8＂ loop does better on increasing the Signal to noise ratio. 2 ）The type of ＂8＂ loop does better on increasing the anti-interference ability, and the stability of the signal is better in the advanced time. 3）When the turn-off time is same, the single loop does better on increasing the resolution and would get richer information. 4）The single loop does better on reflecting low signal than the type of ＂8＂ loop. 5）We can use the type of ＂8＂ loop, when the workplace have big structure or the resistivity of the target is much different from the surrounding rocks.