Abstract: The neuropsychological approach to category learning is an effective pattern to identify theories in category learning. It can not only help us to understand and explore the category learning theories, but also help us to know about cognitive process and brain function. We reviewed the researches to category learning that the patients suffering from basal ganglia, such as Parkinson’s disease, Huntington’s disease, and amnesia, and other nervous dysfunction conducted. We discussed the single-system and multiple-systems theories about interpreting these learning. We pointed out some problems about sampling in these researches, and some suggestions about which need to be improved in the research means, design, and sampling. We hoped that these suggestions can give future researches some help to category learning

Key words: category learning, single-system theory, multiple-systems theory, neuropsychological approach