Abstract:The properties of Ba1-xSrxTiO3 and (V1-xCrx)2O3 double base PTC thermosensitive thick film material were studied. As (V1-xCrx)2O3 was used to replaced the expensive RuO2 and silver powders, the room temperature resistance was lowered, and non ohm contact was eliminated, not only the property of the thick film material was improved but also cost was greatly reduced. Two equations have been independently designed, according to which Ba1-xSrxTiO3 micro powders were prepared by using chemical coprecipitation. The results show that polyethylene glycol (PEG) and anhydrous ethanol can prevent granule agglomeration when making nano powders. As polyethylene glycol (PEG) with large formula weight is not poisonous and no harm to people's health, popularizing it is worth.