The invention provides a memory calculation method and a system suitable for power network analysis, comprising the following steps: collecting power network data; Establishing a first grid object model oriented to grid objects according to grid data; Establishing a second power grid object analysis model based on the memory data grid by using the first power grid object model and the memory datagrid integration method; Data affinity technology being used to bind power grid data to achieve efficient access to services; A service-oriented architecture is adopted to implement the grid analysismemory computing architecture as a whole. The invention alleviates the limitation problem of the real-time memory database of the power network, solves the 'data I/O bottleneck' of the data processing, and provides convenience for the simulation analysis and calculation of the power system.