Abstract: A phosphate mine is a large-scale new underground mine with a scale of 5 million t/a. The original design adopted the main and auxiliary shaft development and rail transportation. In view of the problems existing in the original transportation system，such as construction difficulties，difficult adjustment of transportation capacity，large amount of development work，high construction investment，poor safety and long construction period，according to the distribution characteristics of reserves and the trans⁃ portation demand in the middle section，the whole belt transportation scheme and the 400 m level main belt + panel truck transportation scheme are proposed，and the technical and economic analysis is carried out. By comparison，compared with the original transportation scheme，the 400 m level main belt + panel truck transportation scheme reduces the amount of development work by 205 315 m³ and reduces the project investment by 115.38 million yuan. At the same time，it simplifies the transportation link，improves the degree of mechanization，shortens the construction time，improves the by-product yield of ore，and adjusts the transportation capacity according to the market situation with remarkable economic benefits.

Key words: gently inclined medium thick orebody, belt transportation, truck transportation, underground mining