The paper is an attempt to put forward fitting julyk distribution curve by statistic histogram curves fitting based on area constraint and to estimate whether sample data meet normal distribution or not 摘要提出利用基于面积约束的统计直方图密度拟合方法把试卷成绩样本数据拟合成一条连续的曲线,并判断样本数据是否符合正态分布。