Based on the study of OPDG and object oriented SDG which are the mainstreams of object oriented software slicing representations,their characteristics are given and their similarities and differences are compared.

Based on the study of OPDG and object oriented SDG which are the mainstreams of object oriented software slicing representations,their characteristics are given and their similarities and differences are compared.

The main idea of the algorithm is to retain the control-flow information while the threaded program dependency graph is constructed, with which the threaded realized paths can be identified, by doing this we can improve the slice s precision and slicing s efficiency.

The paper presents a program structure partition method based on the program dependence graph, i.

This paper handled the transitivity of the information flow with the program dependence graph before constructing the IFG.

To resolve the inter-procedural call,the article converted it to intra-procedural call by establishing a suggestive table,which predigested the complexity of establishing the program dependence graph greatly.

A program understanding technique that combines open compile analysis and reflective instrumentation dynamic analyses is introduced to construct static and dynamic combined call graph for assisting program comprehension.

This essay studys more deeply to identify and extract the object from non-O-O programme,classifies and compares the present method of extracting the object,and finds ont its problem by analysing the examples,and picks out the relative data and sub-programmes and compo.