2. The method according to claim 1 , wherein the migration rules include mapping paths which correspond to a pair of the Common Information Model object of the source machine platform and the Common Information Model object of the target machine platform, and step e further comprises the sub-steps of: e1) resolving the dependency between the mapping paths, and repeating steps b-d according to the resolved dependency until there is no further dependency; e2) generating the migration subtask queue in the sequence consistent with the dependency; and e3) inserting an end symbol after all the migration subtask queues are generated according to all the Common Information Model object migration rules obtained at step b.
3. The method according to claim 2 , wherein the step f further comprises the sub-steps of: f1) acquiring a migration subtask from the migration subtask queue; f2) executing the migration subtask; and f3) repeating steps f1 and f2 until reaching said end symbol.