Cognitive training is an interesting topic in Neuroscience. Abacus-mental based calculation (AMC) training improves math ability that indicates it might affect functional connectivity architecture. Modularity analysis showed between-group differences in visual network and cingulo-opercular network (CON). Compared to the controls, increased local efficient observed in visual network, while decreased in CON in AMC experts. An alternative reason is that visual-spatial strategy involving in AMC training rather than languish strategy, leading to different trend to networks related to different function. Our findings shed light on topological reorganization of functional connectivity induced by AMC training.