Detecting the forthcoming events timely is a primary way to minimize their(events) damages in distributed sensor systems. We propose a novel event detection framework for sensor networks with multi microenvironments using fuzzy sets. Fuzzy sets assisted event information description and fusion approaches are proposed,as well as two distributed Node-level forthcoming event detection(NFED) algorithms are devised respectively. Experimental results on both real-life and synthetic data sets demonstrate that our NFED-by leveraging Spatial correlations(NFED-by SC) algorithm only requires a small amount of data transmission with accuracy guarantee. Detecting the forthcoming events timely is a primary way to minimize their (events) damages in distributed sensor systems. We propose a novel event detection framework for sensor networks with multi microenvironments using fuzzy sets. Fuzzy sets assisted event information description and fusion approaches are proposed, as well as two distributed Node-level forthcoming event detection (NFED) algorithms are devised respectively. Experimental results on both real-life and synthetic data sets demonstrate that our NFED-by leveraging Spatial correlations (NFED-by SC) algorithm requires only small amount of data transmission with accuracy guarantee.