Abstract: Because the investment of construction and operational cost is massive for the hot crude oil pipeline. adopting new technique of optimization design is significant to reduce cost and shorten time of design. The author presents a mathematical model Lor the optimal design of the hot crude oil pipeline. The model is a constrained nonlinear optimization problem with mixed discrete variables. So, the thesis adopts improved chaotic synthetic algorithm in solving the model. It is proved that using this algorithm can gain the least annual converted cost and shorten design time in 1 to 2minutes by way of example and contrast with other optimization algorithm(project contrast algorithm, complex algorithm, improved chaotic algorithm).