Four kinds of representative explosives（NH4NO3

mineral explosives

picric acid and DNT） are measured by the gas sensor arrays

which are composed of eighteen doped nano-ZnO thick film sensors.4 mg of each sample is weighed out and dynamic sampling method is used to optimize the sensor arrays

then an optimal sensor array composed of six better sensors are gained.Static sampling method is used to exam the detection ability of the gas sensors.The results show that with the increase of concentrations of samples

the sensitivities of six sensors all increase

and the detection concentrations of samples are low to 3.34 μg/L under the laboratory conditions.For the sake of application

full dynamic sampling method is used and the results demonstrate that all samples can be identified completely at 15.4 μg/L when extracting maximum of slope as the feature to discriminant function analysis.