Abstract: Yielding bolt can effectively solve the problem of deep roadway bolt breakage, Y-bolt is one of the common types, but at present, there is a lack of effective numerical simulation technology in engineering application. By analyzing the characteristics of typical static tensile test curve, the tensile mechanical model of Y-bolt is established. The secondary development of built-in cable element in FLAC3D is carried out by using FISH, and the numerical model of Y-bolt is established, forming a complete numerical simulation technology. The numerical simulation of tensile test shows that when the axial force of the bolt reaches 168 kN, it enters the yielding stage, the elongation increases from 10.51 mm to 29.48 mm, and the axial force remains 168 kN, which is in good agreement with the indoor test results. The numerical simulation of deep buried roadway shows that the broken number of Y-bolt is 80% less than that of normal bolt, and the roof settlement and side wall internal displacement are reduced by 50.6 mm and 26.5 mm respectively.