Electrochemistry　behaviour　of　methandienone　on　glassy　carbon　electrode　was　studied　in　this　paper.　Based　on　the　voltammetric　behaviour　research　results,　it　promises　to　develop　a　new　portable　electrochemical　sensor　for　the　real-time　detection　of　doping.　The　electrochemical　response　of　methandienone　in　0.04　mmol/L　BR　buffer　solution　(pH=2.0)　was　investigated　by　cyclic　voltammetry,　linear　sweep　voltammetry　and　differential　pulse　voltammetry(DVP)　methods,　of　which　DPV　was　chosen　as　the　method　of　quantitive　analysis.　There　exhibited　a　reduction　current　peaks　of　methandienone　at　the　potential　of　-0.932　V,　and　the　peak　current　linearly　increased　with　the　concentration　of　methandienone　over　the　range　of　2.0~60.0　μmol/L.　The　method　detection　limit　(D=2/K)　of　methandienone　was　0.43　μmol/L.　The　method　was　applied　to　the　assay　of　methandienone　in　imitative　human　urine　and　methandienone　tablet　with　satisfactory　results.　The　possible　reaction　mechanism　of　methandienone　was　assumed　to　be　the　reduction　of　one　proton　and　two　electrons.　And　it　is　an　irreversible　reaction.　This　study　provides　the　foundation　for　development　of　real-time　portable　doping　detectors.