The dust electrostatic explosion accidents in polypropylene plant are mainly caused by the interaction of combustible gas,dust and static electricity.,This paper analyses the key parts easy to produce dust and the risks of dust electrostatic by on-site survey of polypropylene plant,and proposes corresponding safety protection measures.The analysis results indicate that:any careless mistakes and deviation in every step of process control may lead to electrostatic explosion in the silo.And if the equipment has some inherent defects and there are some careless mistakes in the process control,it will be easier to cause dust electrostatic explosion accidents.