Abstract: The influence of the difficulty of the target problem namely the related isomorphic problems which have some surfase similarity, and the awareness of the related problems of solvers had been examined by experimental research. Results suggested that during the process of geometry problem solving, the level of awareness of related problems is one of the major factors that influence the effect of problem-solving transfer. Either more difficult or easier the transfer problem will hinder the influence of awareness of related problems during problem-solving transfer, even the achievements of the problem solvers will show floor effect or ceiling effect, and the degree of difficulty of the transfer problems have interctions with the level of awareness of related problems in affecting problem-solving transfer.

Key words: transfer, geometry, difficulty of transfer-problem, isomorphic problems, level of awareness