The characteristics of rough set theory and neural networks and the compementarity of these two theories are studied firstly in this paper,then it puts forward a method of constructing an combined classifier based on rough set theory(C3RST).This novel method includes two stages,in the first stage reduction algorithms are performed to determining the structure of each individual classifier and the amount of classifiers in ensemble.These multiple classifiers are combined in the second stage,by the weight of each classifier is valued based on at...