The Flood Situation Reports released by Beijing Municipal Flood and Drought Control Headquarters Office from 2007 to 2011, daily rainfall data from 20 climate stations and hourly rainfall data from more than 200 automatic weather stations in Beijing are used to make statistical analyses of correlation between heavy rainfall intensity and road waterlogging in Beijing in the past five years, in order to find out the rainfall features, critical indicator of hourly rainfall intensity and road waterlogging caused by rainfall in two hours in Beijing urban area. After applied in road waterlogging 10 times during the flood season (June to August) in 2011, this critical indicator of road waterlogging is proved to have good reference values for road waterlogging forecasting service in the future.