Geography is a branch of comprehensive basic science. In geoscience the problems are so complex and multivariable that we need wide knowledge and a wealth of data to study them from many sides and various angles. So it is necessary to have an aid of a computer in the research. But at the same time it also makes a lot of problems uncertain and difficult to be solved by traditional mathematics.Fuzzy mathematics is a new branch of mathematics, which is a useful means to resolve the uncertain issues, like a bridge leading from qualitative to quantitative way.Obviously, since geography has a great number of fuzzy concepts and fuzzy logics, so fuzzy mathematics will be useful in the near future at least in concept-definition, synthetical evaluation, classification and regionalization, genetic analysis,paleo-environmental analysis, remote sensing,informational interpretation as well as in macroscopic analysis.