An intelligent safety monitoring and alarming system, which adopts industrial control computer as CPU and monitors parameters such as pressure, gas density, temperature etc., is developed for flammable & explosive dangerous objects including tower, container and pipeline, which store and transport all kinds of oil & gas in chemical enterprises. Firstly, the parameters collected with multi-sensors is processed by data fusion method, then those data are evaluated by means of Fuzzy Neural-Net, and the prediction or alarming information as quite-safe, safe, dangerous, quite-dangerous for the state of dangerous objects are given.