用于钻孔测量的环测仪器在国内外获得广泛应用。但在实际工作中，往往出现较大的测量误差，这种误差随着测点数的增加而增大。测量误差可分为偶然误差和系统误差两类。下面对此问题试作分析，这仅是自己的一些粗浅看法。 Ring measuring instruments for drilling measurement are widely used at home and abroad. However, in actual work, large measurement errors often appear, which increase with the increase of measuring points. Measurement error can be divided into two types of accidental error and system error. The following test analysis of this issue, this is only some of their own superficial view.