It　has　been　reported　that　chronic　heroin　intake　induces　both　structural　and　functional　changes　in　human　brain;　however,　few　studies　have　investigated　the　carry-over　adverse　effects　on　brain　after　heroin　withdrawal.　In　this　paper,　we　examined　the　neurophysiological　differences　between　the　abstinent　heroin　addicts　(AHAs)　and　healthy　controls　(HCs)　using　nonlinear　dynamic　analysis　and　source　localization　analysis　in　resting-state　electroencephalogram　(EEG)　data;　5　min　resting　EEG　data　from　20　AHAs　and　twenty　age-,　education-,　and　gender-matched　HCs　were　recorded　using　64　electrodes.　The　results　of　nonlinear　characteristics　(e.g.,　the　correlation　dimension,　Kolmogorov　entropy,　and　Lempel-Ziv　complexity)　showed　that　the　EEG　signals　in　alpha　band　from　AHAs　were　significantly　more　irregular.　Moreover,　the　source　localization　results　confirmed　the　neuronal　activities　in　alpha　band　in　AHAs　were　significantly　weaker　in　parietal　lobe　(BA3　and　BA7),　frontal　lobe　(BA4　and　BA6),　and　limbic　lobe　(BA24).　Together,　our　analysis　at　both　the　sensor　level　and　source　level　suggested　the　functional　abnormalities　in　the　brain　during　heroin　abstinence,　in　particular　for　the　neuronal　oscillations　in　alpha　band.