This paper gives the mathematical model of landfill gas based on the fuzzy seepage theory,and get the analytic result by use of fuzzy structuring element.

While the fuzzy power flow is based on fuzzy set theory and has no standard solution till now,the credibility theory,a mathematical branch in the study of fuzzy phenomenon,provides the axiomatic foundation for fuzziness.

A methodology for fuzzy load prediction, fuzzy power flow calculation and fuzzy optimization is presented.

By use of credibility theory based fuzzy power flow algorithm, a short-term planning model for transmisison network and corresponding algorithm are built.

Rough communication proposed by Amin Mousavi is popularized,and fuzzy rough communication is proposed.

The conception of variation fuzzy rough sets is presented and its relevant properties and theorems are discussed;then the mathematics model of the optimum translation sequence of fuzzy rough communication is built,and the algorithm thought how to solve this kind of mathematics model is provided;finally the instance verifies the effectiveness of the algorithm thought.