Abstract: The Modified Configuration Interaction method(MCI) is used to calculate the correlated energy of multi-electron systems.For obtaining the higher precision,it calls for huge computings.In order to handle this problem,which will cost much CPU time and memory room if only using one CPU to do it, the parallel multisection recurrence algorithm is adopted by using several CPUs to get the ground state energy of Helium atom at the same time.

Key words: parallel multisection recurrence algorithm, large eigenvalue problem, Modified Configuration Interaction method(MCI), the electronic correlated energy