We theoretically study the slow light based on coherent hole burning in a three-level Λ-type hot atomic system without Doppler-free configurations. With the numerical calculations of the density matrix of the system, the effects of the configuration of the atomic levels, the spontaneous radiation and the dephasing rate on slow light are considered. Due to the coherent effect induced by the coupling field, one can obtain a greater group index by coherent hole burning than that of saturation absorption spectroscopy. Our results are useful to realize the atomic coherence effect, slow light and light storage in diverse hot atomic systems.