A barrier discharge device composed of two rectangular copper electrode is developed to generate anatmospheric pressure helium discharge.This discharge characteristics generated in a wedge gap is studied.lt isfound that with the inerease of gas flow rate , the discharge length along with breakdown voltage and spectraline intensity displays inerease rapidly-decrease slowly-almost unchanged, but discharge current firstlydecreases slowly , then increases rapidly ,finally almost unchanged.The characteristic regions are obtained. The underlying physical correlation has been established among discharge length charaeteristic region , breakdown voltage characteristic region , discharge current characteristic region , and spectral intensity characteristic region.