Research conclusions: Through analyzing the reasons for setting the successive route for 6‰descending grade and the sophistication of the braking capability and control equipment of the train running on passenger dedicated line，the idea is expressed in this paper that it is unnecessary to set the successive route when there is a 6‰ descending grade on passenger dedicated line．This idea breaks through the regulation of The Chinese Railway Specifications，but has significance to decreasing the investments in the railway track and signaling equipments，reducing the land occupation and enhancing the traffic capacity．