Polypyrrole/graphite　oxide　(PPy/GO)　composites　are　successfully　prepared　via　in　situ　chemical　polymerization　with　various　feed　ratios　of　pyrrole　(Py)　to　graphite　oxide　(Py:GO　=　0.5:1,　1:1,3:1,　5:1).　The　electrochemical　performance　of　the　composites　is　determined　in　a　three-electrode　cell　using　cyclic　voltammetry　(CV),　galvanostatic　charge-discharge　(GCD)　and　electrochemical　impedance　spectroscopy　(EIS)　techniques.　The　relationship　between　properties　of　PPy/GO　composites　and　effect　of　the　feed　ratio　of　pyrrole　to　GO　is　investigated,　and　the　results　indicate　that　the　thermal　stability,　electrical　and　electrochemical　properties　of　the　composites　are　strongly　influenced　by　the　feed　ratios.　The　electrical　conductivities　of　the　PPy/GO　composites　are　1.27　S　cm(-1)　(Py:GO　=　3:1)　and　6.25　S　cm(-1)　(Py:GO　=　5:1),　which　are　significantly　larger　than　that　of　pristine　PPy　and　GO.　The　PPy/GO　composites　exhibit　very　high　specific　capacitance　and　low　charge　transfer　resistance.　Especially,　the　specific　capacitance　of　the　PPy/GO　composites　(Py:GO　=　3:1)　reaches　249　F　g(-1)　at　discharge　current　density　of　2　mA　cm(-2),　while　the　charge　transfer　resistance　is　only　0.12　n.　The　fabricated　PPy/GO　composites　can　be　used　for　the　development　of　new　applications　for　supercapacitor.　(C)　2013　Elsevier　B.V.　All　rights　reserved.