A multidimensional grouping classification method based on multi-bit division includes following steps: 1) establish a decision tree root node, and assign the full set of the rules set of classification algorithm to the root node; 2) recursively divide each node of decision tree with the corresponding rules set, and generate a number of sub-nodes, and each sub-node corresponds to a rules subset after the division; until the scale of all the rules sets of the nodes is smaller than a certain predetermined threshold; in which, the said division method including the following steps in turn: convert the rules table into two-dimensional bit array, and evaluate the performance when each bit generating decision tree, and according to the performance influence scale, select the bit to generate decision tree. This invention uses bit value as the basis of node separating, and based on the new view of bit division, to establish the decision tree, so the established tree is small in scale, and thecomprehensive performance is very good in time/space.