The detection of explosives and explosive related illicit materials is an important area for preventing terrorist activities and for putting a check on their deleterious effects on health. A number of different methods, based on different principles, have been developed in the past for the detection of explosives. The objective of this article is to provide information on the using of electrochemical sensors for the detection of trinitrotoluene (TNT) at ppm levels. Using carbon fiber microelectrode, electrochemical behaviors of TNT were investigated. It is shown that in phosphate buffer with pH 9 under pulse height and wide 70 mV and 40 ms respectively, amount of TNT can be detected is 1.5 ppm. It is comparable with other publications. By meeting the stability, portability and low-cost demands, such as voltammetric sensor holds great promise for field measurement of contaminated water sites.