Abstract: Partial orebody of Yongshaba mine of Guizhou Kailin Group located below Jinyang highway which the amount reaches to 22 620 000 ton. Room and pillar type medium-length hole fall ore afterwards cementation filling mining method based on the test and analysis of mechanics parameters are done on ore-rock. Meanwhile, stope structural parameters are selected by numerical calculation method, and safe exploitation of phosphorite under highway is realized.

Key words: merical calculation method, and safe exploitation of phosphorite under highway is realized.
Keywords:    , Under highway mining, Room and pillar type medium-length hole fall ore afterwards cementation filling mining method, Numerical calculation, Stope structural parameters