Abstract: Through analysis of failure characteristic and mechanism on two-side anchorage body in deep mine gateway，we get most serious failure spot of two sides in middle-upper part．Bolting function is to form anchorage body structure because of the force between bolt and rock in anchorage range．The instability of two-side anchorage body in deep mine gateway is divided into fracturing and shearing instability，and first instability form of two-side anchorage body is fracturing instability．The paper establishes stability mechanical model of two-side anchorage body in deep mine gateway under two instability forms，which provides bolt and cable couple-support scheme and carries out mechanical calculation，numerical analysis and field observation on test gateway．After carrying out support design scheme on gateway two sides，two-side convergence amount decreases. The largest displacement amount is 124 mm，which is controlled in reasonable range. Two-side surrounding rock is stable，and the support effect is remarkable．

Key words: deep mine gateway, bolting, two-side anchorage body, mechanical mechanism, stability