An impact analysis-based task redoing method using an impact analysis calculation apparatus and a one-click resetting apparatus includes receiving an impact analysis request, where the impact analysis request includes a source procedure identifier, an impact start time, and an impact end time; obtaining a dependency list and a procedure information list of a source procedure according to the source procedure identifier; obtaining a period of the source procedure and a period of a target procedure according to the source procedure identifier and the target procedure identifier in the dependency list; obtaining, according to the period of the source procedure, the period of the target procedure, the impact start time, and the impact end time, a procedure instance list corresponding to each procedure identifier included in the procedure instance list; and sending the procedure instance list and the procedure information list.