A method based on the nature of the proportion scale and the idea of rank difference for constructing fully consistent judgment matrix,called generalized scale method(GS method.

The effect of tolerance grade,basic error and size on spares cooperation performace is introduced,and some problems should be noticed are expounded.

A method of optimization in precision distribution is presented that makes use of the minimum economic angle and with tolerance grade as the optimization unit thus greatly reducing the number of optimization steps necessary.

The method for finding"heng-diameter"and"gui-length"in the Zhou Bi Suan Jing(Arithmetical Classic of the Zhou Gnomon)can be regarded as an application of linear interpolation, while that for finding sun s displacement in the Dayan Calendar is similar to the sum formula of arithmetical series proposed by Liu Hui.