Mall-Kendall以气候、下垫面一致为前提，要求序列随机独立且同分布，用于突变点的识别。
UFk为一条随k变化的曲线，当n增加时，UFk很快趋于标准正态分布。
假设H0成立。给定显著性水平α，查算正态分布表得。当|UFk|＜时，接受原假设，即趋势不显著；反之，拒绝原假设，即趋势显著。
在坐标轴上绘制两条曲线，若相交，则交点为突变点。这就是Mall-Kendall法。(Mall-Kendall to climate and underlying surface consistent is the premise of independent and identically distributed random sequence requirements for point mutation identification.
UFk is a K with the curve, when n increases, UFk has quickly become the standard normal distribution.
The establishment of H0 hypothesis. A given confidence level, check the normal distribution table. When |UFk| <, accept the null hypothesis, that trend is not significant; on the other hand, reject the null hypothesis, namely a significant trend.
Draw two curves, in the axis if the intersection, intersecting point for point mutation. This is the Mall-Kendall method.)