Inthepresentpaper,theauthorsumsupandanalyzesdescriptionsaboutneedle-insertiondepthinChineseclassicalmedicalbookHuangDiNeiJing(TheYellowEmperor'sInternalClassic).InmanychaptersofNeiJing,theneedle-insertiondepthisstressedtobevariousaccordingto1)thedeficiencyorexcessofsyndromes,2)thepatients'constitution,3)theseverityofdisease,4)thedurationofdisease,5)thelocationofdisease,6)thepatient'sage,7)thelocationoftheneedledacupoint,8)theseason,9)thepatient'stemperament,10)thepulsecondition,11)thestateof'Deqi',and12)thelocationoftherunningcourseofmeridians.Inaddition,differentkindsofdiseasesanddifferentstagesofdiseasesalsoneeddifferentdepthsofneedleinsertion,differentmanipulatingskillsanddifferentstimulatingquantity.
