Abstract: An improved structure of Christmas light mainly includes a bottom base, a light stand as well as an alterable lamp holder. There is further a pair of first and second copper conductors, each having several triangular barbs laterally formed in order to prevent the copper conductors from moving away from the light stand and causing a short circuit. The copper conductor further has an end tip point reinforced with a groove so as to effectively puncture into the electric wires without increasing its thickness saving material cost. Taking advantage of a detachable light stand the lamp holder may desirably be changed to various lamp holders of different shapes to acheive a cosmetic effect. Furthermore, due to the structure of the vertical pole on a bottom base which has an inverted fastening head longer than that of the prior art a linking effect in snap fitting results.