Abstract: The present invention is related to a lamp assembly, and in particular, related to a Christmas lamp assembly comprising a lamp bulb and a lamp holder integrally molded of synthetic resin in a water-proof manner.With the lamp bulb and the lamp holder according to the present invention, the former may be easily inserted into the latter for desirable electric connection, which may efficiently prevent raindrop or sludge from penetrating the inside of either of them and thus solve the problems of current leakage or short circuit in a conventional lamp assembly.