为了尽量减小羟基(OH)分子示踪流场速率测量误差、提高测量精度，利用OH分子标记线沿宽度方向的强度分布近似为高斯函数的特征，用高斯函数对实验测量数据进行了拟合，用拟合数据的峰值位置作为OH分子标记线的中心位置，并以此作为测量基准位置，对典型的OH分子示踪速率测量数据进行了处理。结果表明，采用这一数据处理方法，可使流场速率计算精度明显提高。

In order to increase the velocity measurement precision of hydroxyl tagging velocimetry(HTV), experimental data were fitted with Gaussian function because the intensity of the tagging lines is in Gaussian distribution along width direction. Then the fitted peak position was regarded as the center position of the tagging lines. Finally with the center position as reference position, typical measurement data for hydorxyl tagging velocity were processed. The results show that the precision of velocity can be improved distinctly by means of this algorithm.