Edge　is　a　basic　feature　of　an　image,　the　purpose　of　edge　detection　is　to　reduce　the　amount　of　data　in　an　image　while　preserving　the　shape　information　of　objects.　Field　programmable　gate　arrays　(FPGA)　are　best　suited　to　implement　image　processing　algorithms　with　the　reason　that　it　provides　infinite　reprogram　ability　and　high　parallelism.　The　aim　of　this　paper　is　to　design　a　real-time　sobel　extract　system　based　on　HLS　method　and　the　implement　it　on　ZYNQ　FPGA.　The　result　shows　the　software　processing　time　is　almost　80　times　than　the　hardware　processing.　The　hardware　acceleration　has　remarkable　effect　on　sobel　filtering.