Based on the theory of grey target

the patterns of different schemes on the overland mobility of tank are formed with the principal tactical and technical performance indices

and then a standard pattern is constructed according to ideal or better performance values.Performance evaluation of the schemes is realized by calculating the approaching degree of each pattern to the standard one.It is evaluated that the overland mobility of tanks produced by different countries and during different periods with very simple algebraic operation.The conclusions obtained agree with the results verified by other evaluating methods and the actual using situation of tanks in battlefield.Therefore

the method is proved to be valid.