The design for pumping station is the necessary work to the design for dike,the standard for design high or low will be a big effect to the investment.Too high waste the resource and too low the capability of controlling is not enough,and cannot resolve the problem of water logging control.To now there is not a uni -form standard all through the country.To Guangxi 's standard for water logging control,in the region-class cities the standard is both-flood-encounter once twenty years(P=5%),the biggest24h precipitation flood is drained off in24h,the standard in county-class cities is lower accordingly.Using the probability synthesis prin ciples the text analyses and probes the rationality to the standard for water logging control and applicability for statis-tical method,the result is not only rational but also the statistical method is feasible.