The invention provides a construction method of an analytic model of dynamic partitions, which comprises the following steps: determining a blocked line set, an optimal partition number and attribution of power generation nodes to partitions based on quotation information, blocked line information, power grid power flow distribution and a topological structure of each power generation node of a power grid; obtaining the attribution of the non-power-generation node to the partition based on the information by using a fusion algorithm; and determining the optimal affiliation of all the nodes tothe partitions, and dividing clear boundaries among the partitions. Through an analytic dynamic partition model taking node electricity price drop as guide and fusion algorithm taking blocked line analysis as guide for node partition affiliation, a complete comprehensive dynamic partition pricing model based on an analytic method and a fusion algorithm is established. The analytic method successfully solves the problem of unit partition and the problem of regional intersection of power generation nodes which are not solved in the past, the fusion algorithm solves the problem of partition boundaries, and the method has a good application prospect.