Source code as object for research in this paper, mechanism of pointer and relation of association about pointer type object (variable) within multiple source files is studied. Based on the extraction of message and packing up the results, automatically visualize the elation about source files and mechanism of pointer in C plusplus. The storage mechanism on extraction and an algorithm of automatically disposing the include-relation on files are proposed. As a supplement, an algorithm of manual adjustment for meta-graph is introduced. The actual analysis results on codes show that the research is conducive to support for program analysis and understanding of source code.