In order to make full use of the accumulated monitoring data in the field of flood control security, accurately understand the situation of flood control security and form a scientific comprehensive decision, the construction and visualization methods of situation map for the flood control security of river basin was proposed. From characteristics, relationships and behaviors of spatial-temporal objects, based on the ontological method of situational theory, this study clarified the concept of relevant situational awareness to built up an indicator system of flood control situation and put forward the trend graph modeling and visualization methods, for the flood control security of river basin. Finally, the proposed methods were applied in the Danjiangkou Reservoir Basin, which has enlightenment and reference significance in the flood control security.