In　order　to　investigate　the　skill　learning　of　heuristics　problem-solving,　we　took　simplified　4×4　Sudoku　as　a　new　task.　Brain　activity　was　recorded　when　participants　solved　Sudoku　problems　with　fMRI,　and　compared　before　and　after　plenty　of　practice.　According　to　the　adaptive　control　of　thought-rational　(ACT-R)　model,　we　found　that　the　activations　in　the　areas　of　bilateral　prefrontal　cortex　and　posterior　parietal　cortex　decreased　by　extensive　practice.　It　might　indicate　that　the　identification　of　the　problem　situation,　the　problem　representation　and　efficiency　of　the　declarative　knowledge　extraction　were　improved　greatly　in　the　skill　learning　of　heuristic　problem　solving.　©　2012　Springer-Verlag.