This paper discussed one of them which implemented DOM interface using C++ language.The parser was a light-weight one.It didn't contain the function of well-formed validation.The main purpose was to provide a refine,rapid,low memory-cost XML parsing interface which supports DOM as much as possible.It discussed the model of the parser and how to implement it using LEX and YACC.The C++ implementation of DOM Level 1 Core and its co-work ability with the parser were also discussed.