Continuous-wave　terahertz　total　internal　reflection　digital　holography　(THz-TIRH)　is　proposed　for　the　full-field　and　real-time　complex　refractive　index　measurement.　The　amplitude　and　phase　images　can　be　reconstructed　from　the　hologram,　subsequently　the　analytic　solution　of　refractive　index　distribution　can　be　reviewed.　The　experimental　result　demonstrates　the　feasibility　of　the　THz-TIRH　imaging　method.　Both　absorption　distribution　and　refractive　index　distribution　are　imaged　by　THz-TIRH　1　in　this　paper.