Abstract: In order to solve the problem that the morphological parameters of the dumping field interact with each other and it is difficult to achieve the overall optimization, this paper established an overall optimization model for multi-parameters of decision-making dumping ground based on the relationship between the cost of dumping and the change of morphological parameters of the dumping site. A specific solution algorithm was given. An empirical study was carried out with an open-pit mine as an example. The results showed that the optimal morphological parameters of the open-pit mine were: the bottom radius of the bottom step was 945 m, the single step height was 30 m, the final flat disk width was 40 m, and the step slope angle was 33°, the number of steps was 4, and the slope of the slope was 8%. The shape parameters of the dumping site determined by the model met the requirements of the project implementation, and the results were available. It was revealed that the transportation cost increased with the increase of the number of steps, and there was a U-shaped change which means the transportation cost increased first and then decreased. So, there was an optimal disposal height, which was generally about 120 m. In practice, it should not only pursue the increase and expansion. Under the premise that the final elevation is the same, the transportation cost increases with the increase of the bench height. When the land price is lower, the bench height should be appropriately reduced according to the operating parameters of the equipment. When the land price is higher, the bench height should be increased properly to save the cost of dumping.