Abstract: The key of image fusion technique is to select appropriate fusion arithmetic and fusion rule in order to analyze the impact of fusion rule to the fusion performance，four fusion rules are adopted to perform fusion experimentation with AVHRR and MODIS images and six statistical indexes are used to compare the fusion capability.This paper draws the conclusions that there are some capability differences between different rules and the fusion capability is different in different index even using the same rule.It is preferable to select fusion rules according to image fusion aim.

摘要： 基于小波变换的数据融合技术的关键是融合算法和融合规则。为分析不同融合规则对融合性能的影响，选用四种小波高低频系数的不同规则组合进行融合实验，并应用六种统计指标进行融合效果的比较，结果表明，融合规则不同，融合性能会有差异，而同一种融合规则，不同的统计指标也反映其融合性能的优劣差异，有时差异还很明显。因此，应根据不同的图像融合目的选择合适的融合规则和融合算子。