The Wutaizi reservoir has been in work for years, parts of the reservoir due to aging factors have many hidden hazards, and the key to its rehabilitation design is the review of flood control standard. The river which the reservoir is located at has no existing hydrologic data, hence the designed storm/flood calculation method which suits for region without data is used to review and analyze designed storm and flood with different frequency. After reviewing the flood control standard of Wutaizi reservoir is designed by once every 10 years and rechecked once every 20 years. The review is of great support for reinforcing process and engineering operation.