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Ｋ指数以０，１，……，９的数字分为１０级，以３小时为一时段，简单、直观、清晰地表示出地磁场受太阳微粒辐射而形成的扰动变化的程度。Ｋ指数测量是地磁台日常工作的重要内容之一。正确地区别Ｋ变化与非Ｋ变化是测量Ｋ指数的基本要求和关键所在。我国地磁台站从１９８９年开始用规则日变化ＳＲ代替“铁曲线”来识别Ｋ变化与非Ｋ变化，使测量方法与国际上的通行做法相一致。本文通过对我国地磁台站的Ｋ频次分布统计指出，在采用新的测量方法以后，我国地磁台站的Ｋ指数测量的总体水平逐年提高，但各台站之间的测量水平有一定的差距，特别是在磁场平静或扰动不大，需要仔细识别ＳＲ变化时，有的台站将ＳＲ估计过大，使Ｋ值偏向低Ｋ端；有的又将ＳＲ估计过小，使Ｋ值偏向高Ｋ端；有的则表现为识别水平的不稳定。因此，正确地识别ＳＲ仍然是今后Ｋ指数测量中必须重视的问题。
The K-index is divided into 10 levels by the numbers of 0, 1, ..., 9 and the period of 3 hours is a simple, straightforward and clear indication of the degree of disturbance caused by the radiation of the solar magnetic field from the geomagnetic field. K-index measurement is one of the important contents of geomagnetic station's daily work. Correctly distinguish between K and non-K changes K-index measurement is the basic requirements and the key. Since 1989, geomagnetic stations in China have replaced the “iron curve” with the daily SR rule to identify the K-change and non-K-change, making the measurement method consistent with the international practice. Based on the statistics of K-frequency distribution of geomagnetic station in our country, the overall K-index measurement of geomagnetic station in our country increases year by year after adopting the new measurement method, but there is a certain gap in the measurement level between stations. Especially when the magnetic field is quiet or not perturbed, SR needs to be carefully identified. Some stations estimate the SR excessively large so that the K value is biased towards the low K end. In some cases, the SR estimation is too small and the K value tends to be high K While others show the level of instability. Therefore, the correct identification of SR is still the key issue in the K-index measurement.