With the thinking aloud approach, quantitative and qualitative analysis has been made on the thinking process of six college students, who speak standard Chinese, while describing some pictures.

Rough set integrated neural network method reflects the human's normal thinking mechanism which mixes the method of quantitative and qualitative, clear and uncertain, serial and parallel.

The research in the issuing scope of national debts cannot do without mathematics thinking modes and mathematics methods, such as qualitative analysis and quantitative analysis.