Ordered mesoporous WO₃and Ag-loaded mesoporous WO₃have been synthesized by using three- dimensional cubic KIT-6 as a hard template. A series of material characterization methods were employed to characterize the as-synthesized materials above and gas sensing properties were measured. It showed that the as-obtained ordered me soporous structure materials have excellent crystallite and the pore sizes were about 9 nm which matched with the result of BET results. Furthermore, the NO₂sensing properties of the sensors based on mesoporous WO₃and different molar ratios of Ag-loaded (0.2%, 0.5% and 1.0%) mesoporous WO₃were detected by utilizing a static test system, respectively. The sensor using 0.5% Ag-loaded mesoporous WO₃exhibited much higher response, shorter response and recovery time and excellent selectivity to NO₂comparing with the sensors those based on other Ag-loaded ratio mesoporous WO₃and the pure mesoporous WO₃.