本程序用VBA（宏）编写，用于计算水文统计频率P3型分析，比如降雨频率分析和径流分析。程序是宏与Excel结合，使用简单易用。,This procedure using VBA (macros) to prepare, when used to calculate the frequency of hydrological P3 statistical analysis, such as frequency analysis of rainfall and run-off analysis. Excel macro procedure is combined with the use of easy to use.