In according to the characteristics of plumb zone and nonparallel and boundary indistinctness and transition of weathering rock mass, to make use of the cutting method of the order data, dealing the order data, obtaining the best cutting points.

In this paper, by using the principal component analysis and optimal sorting method, we get a solution for the assessment of educational practise and then give the calculation of a example.

Mathematics geological study is also applied to stratigraphic classification using multi\|variable optimum partition.

<abstract>e comprehensive method of the element - stratum , optimum division and the filtration in classifying forma tions in Mesozoic of Jiyang depression is tried out .

This paper first points out some problems in assessing the results of educational practice, then proceeds to suggest, from the point of view of discriminate analysis and optimal partition in multivariate tactical analysis, the optimized method for such assessment with the help of examples.

Based on the concept of the optimal partition,the characters of the optimal value function and the critical regions for linear programming problem with higher-dimensional parametric cost coefficients are studied.

Successive optimum dichotomy of logging series based on mean value of single layer;