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通过对东风（７Ｄ）型机车牵引热工性能试验主要参数的分析，表明东风（７Ｄ）型机车作为干线货运机车，达到了设计任务书的各项要求。同时，提出东风（７Ｄ）型机车所运用的区段运输成本高，万吨公里燃油消耗量是一般地区的３倍，应根据机车运用走行公里与累计燃油消耗量，合理地确定增压器的维护保养期，提高机车的可靠性。
Through the analysis of the main parameters of the traction thermal performance test of Dongfeng (7D) locomotive, it shows that the Dongfeng (7D) locomotive as the trunk freight locomotive meets the requirements of the design task book. At the same time, it is suggested that the transportation cost of the section used by Dongfeng (7D) locomotive is high, and the fuel consumption per tonne kilometer is three times that of the general area. The maintenance of turbocharger should be reasonably confirmed according to locomotive running mileage and accumulated fuel consumption Maintenance period, improve locomotive reliability.