Abstract: To avoid the dependence of external pulse ignition source and increase operating frequency of a pulse detonation engine, a novel serial detonation chambers scheme PDE was offered. Detonation was initiated through hot jet from conjoint detonation chamber, from one to the next. Experimental results show that the hot jet can spread through chambers and each chamber can be initiated fast in a short distance. The initiation time is about 1.0~1.2ms, and the distance is about 500mm. Weak hot jet also can be enhanced after a few tubes and initiate mixtures in a certain chamber downstream. The time between jet-in and jet-out in one chamber is 1.2~1.5ms, considering other time in a whole cycle, maybe 8 chambers are needed for running at the mode of close spread jet.