In the process of bottom water reservoir development，the bottom-water cresting of the horizontal well is the key factor affecting the development effect，while the research on the influential factors of the water cresting morphology is relatively few. The numerical conceptual model of bottom water reservoir was established based on the actual reservoir parameters of M oilfield using the technology of reservoir numerical simulation. Quantitative description formula for the water cresting morphology was built by regression according to the formulas of the horizontal well productivity proposed by Cheng Linsong et al. The influence of horizontal well spacing，horizontal and vertical permeability ratio，liquid production of single well，vertical position of horizontal well，oil-water viscosity ratio and water cut on the recovery percent and water cresting morphology was analyzed. Analysis results show that along with the increase of horizontal well spacing，the recovery percent and the maximum water cresting radius decrease，but the water cresting volume presents a tendency of increase in general at the same water cut；along with the increase of horizontal and vertical permeability ratio and oil-water viscosity ratio，the recovery percent decreases and the maximum water cresting radius and volume decrease gradually at the same water cut；along with the increase of liquid production of single well，the recovery percent, the maximum water cresting radius and volume were increasing in general at the same water cut, but the maximum water cresting radius and volume slightly decreased at certain liquid production；if the vertical position of the horizontal well is closer to oil-water interface，the recovery percent and the maximum water cresting radius and volume decrease；the maximum water cresting and volume increase gradually along with the increase of water cut. Box-Behnken experimental design method was used to obtain the order of influential factors of each control factor，and the interactive effects of each factor on water cresting morphology. The results show that the order of degree of the influential factors on water cresting morphology was concluded as horizontal and vertical permeability ratio>oil-water viscosity ratio>vertical position of horizontal well>liquid production of single well>horizontal well spacing. The interaction of horizontal and vertical permeability ratio，liquid production of single well，oil-water viscosity ratio and horizontal well spacing on the cumulative oil production is the most obvious.