Continuous-wave　terahertz　digital　holography　is　a　practical　tool　to　obtain　the　complete　wave-front　information　of　a　sample　in　the　terahertz　region　that　has　offered　unique　advantages　in　various　fields.　The　propagation　distance　plays　a　decisive　role　in　the　numerical　reconstruction　of　both　in-line　and　off-axis　digital　holograms.　Only　when　a　terahertz　hologram　is　propagated　back　to　a　focal　object　plane　can　the　authentic　amplitude　and　phase　distribution　be　reconstructed,　which　is　actually　a　troublesome　task.　In　this　manuscript,　the　combination　of　hologram　enhancement,　spectrum　filtering,　phase　retrieval　and　phase　unwrapping　algorithms　is　illustrated　and　organized　to　benefit　the　decision-making　process　of　the　autofocusing　method　not　only　for　the　amplitude　distribution　but　also　for　the　phase　image.　To　guarantee　the　accuracy　of　the　autofocusing　results,　the　noise　of　the　hologram,　the　intrinsic　twin　image　in　the　amplitude　and　phase　results　and　the　wrapped　ambiguity　in　the　phase　distribution　are　suppressed　or　lessened　by　using　the　four　techniques　stated　above.　The　focused　amplitude　and　unwrapped　phase　distributions　of　the　sample　are　reconstructed,　and　experimental　verification　confirms　that　the　present　hybrid　autofocusing　method　is　a　feasible,　effective　and　promising　technology　with　broad　application　prospects.