In this paper, the flooding events in boerbosong basin is studied using observed flood depth data, digital elevation map （DEM） data, land use type data, hourly precipitation data, quantitative precipitation estimation(QPE) data, et al.FloodArea model was utilized to simulate the flood process of the study area on 25 August 2013, 28 June 2015 and 17 June 2016.The spatial and temporal distribution characteristics are analyzed based on the precision test of the measured data.Then the relationship between surface rainfall and submerged depth was established, and the critical rainfall corresponding to the four flood levels in the study area was determined.It is also found that the submerged depth is increasing, which can be divided into three stages: accumulation period, stable growth period and fluctuation uplift period.Through precision verification, the flooded depth derived by FloodArea model is higher than observation, while QPE and R-QPE (revised quantitative precipitation estimates data）data are lower than that observed.The above three data simulation results absolute error of the investigation points（borborzon and Tal village） is 0.46 m, 0.78 m, 0.35 m and 1.35 m, 1.44 m and 0.65 m respectively.R-QPE data can simulate the flood depth with the best accuracy and can reflect the flood situation of the basin.Through correlation analysis, the correlation between the surface rainfall of the cumulative aging for 7 h and the simulated flood depth is the best, with the correlation coefficient reaching 0.989.On this basis, the relationship between surface rainfall and submerged depth is established.The relationship between surface rainfall and flood depth was obtained according to mountain flood disaster grade, the cumulative aging of 7 h surface rainfall at the early-warning point can obtain the threshold values of four levels of critical rainfall causing disasters: level 4 is 6.25 mm, level 3 is 23.61 mm, level 2 is 49.64 mm and level 1 is 75.67 mm respectively.
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