This paper presents a method which calculates automatically parameters for longitude-latitude frame accgrding to the trapeze sheet number.

this paper studies the tree-width of some special graphs by the decomposition theorems of tree-width,such as,the join of many graphs,(m,n)-configuration,grid graph on a fan and meridian and latitude lines on a sphere,and gives some advice of further research.

An Analysis of the Phonological Changes in A Standard Phonological Table;

A block diagrama is very useful tool in teaching.

Using the method of metwork technology,We can outline large engineening proects, anal-yse their systematic speciality and classify the networks according to their characteristics and structures to establish their dynamic block diagram.