To ensure polycarbosilane work safely,according to relevant national testing standards and instruments,three fire and explosion characteristic parameters of polycarbosilane dust were tested,including minimum ignition energy,minimum ignition temperature and minimum explosion concentration using the standard instrument.The results show that minimum ignition temperature is 320 ℃,the minimum ignition energy is 1.5 mJmin<2 mJ,minimum explosion concentration is 12 g/m³＜C_min＜13 g/m³.Combined with the fire and explosion characteristics of common explosive dust,the minimum ignition energy is low and the minimum explosion concentration is small, indicating that the polycarbosilane dust is easy to be detonated.