Polynomial - weighted technique was adopted to assess the results of the experimental semivariogram function fitting results and based on the results selected the gaussian model with nugget effect as the fitting model . 100 times of simulation were carried out on the as distribution condition in the study area 采用加权多项式法，对经验半变异函数拟合结果进行评价，并根据结果选择了带块金效应的高斯模型作为拟合模型对研究区砷分布情况进行了100次模拟，模拟结果平稳。
