Since there are some limitations when we solve some engineering problems by the mathematical model and physicaI modeI,we propose a long river reach hybrid model synthesizing the advantages of the physical model and mathematical model,summarize the development situation and the advantages and disadvantages of the model at home and abroad.Combining with the applications of the physical model and mathematical model in waterway regulation engineering,we put forward the research idea and method of long river reach hybrid model in the waterway regulation engineering.