Abstract:  In this paper,we reseach the following form of approximate reasoning ... .First we put forward two reasonable approximate reasoning principles,then,accordingg to the two reasoning principles we construct a new kind of approximate reasoning methods.The basic idea which the new  kind  of approximate  reasoning  methods  is  that  according  to  the  strength  p(A₁(x₁),…,A.(z.))→B (y)which     A₁(x₁),…,A.(z.)implicate     B(y)and     the     degree     of   A(x) approximates     to     A(x),we  determine the upper limit and B(y),then take a definite value    (y) in  between  the  upper limit  and the lower limit,and make the reasoning method satisfied the two reasoning principles.

Key words:  approximate ,  reasoning;language ,  truth ,  value;reasoning ,  principle;partial ,  truth;expert system