With hollow-through DTH hammer reverse circulation continuous coring (sample) technology, slagging or halfway slagging while drilling in the “hard, brittle, broken” complex formations are often encountered; to solve these problems, a new type of internal jet orifice reverse circulation bit was optimally designed on the basis of the existing hollow-through DTH hammer RC bit, which can form the powerful multilevel injection-suction fluid field. The article also imitates and analyzes the influence of 2 structural parameters of internal jet orifice level angle and the offset distance between internal jet orifice axis & the bit midpoint to the suction capacity of new RC bit structure. The simulation analysis has verified that the structure of such a RC bit is simpler with good reverse circulation effect.