Abstract:A set of software for analyzing the data from yield tests of randomized block design were developed with TURBO C language. The programs were compiled and tested on Great Wall series of personal computers. The software can be used to analyze the data collected from different experiment of randomized block designs including single environment, multi—location, multi—year and multi location tests. The output of the soft ware includes variance analysis, effects of genotype × environment, parameters of adaptability and genotypic stability in terms of yield. It is useful in helping the users to fully exploit the information and to make object decisions from the experiment data.