The difference of the delay time of non-primary detonator was compared by using PETN and RDX as the excitation powder, and the data were analyzed based on hot spot initiation theory. The results show that in non-primary instantaneous electric detonator, PETN and granulated RDX can be used as the excitation powder, but the delay-time of PETN (8.33 ms) is shorter than that of granulated RDX (9.35 ms), in non-primary non-electric delay detonator, the delay-time of the granulated RDX as the powder is steady; PETN can be used as the excitation powder in instantaneous or lower non-primary non-electric delayed detonator.