Abstract: This article develops a parallel depth-averaged 2D flow model.Since the message passing interface has not implemented the process transference function,the article researches message parallel platform for the model.The platform adopts ant algorithm to schedule tasks and constitutes message protocol to pass message.After its applying it to changjiang river of neijiang,the results indicate that if machines count is less than the oriental count,the consumed time increases along with the adding machine count and vice versa.