The aim of MDA is to increase the quality and speed of system development by using modeling techniques. However, the lack of accurate semantic language support has hampered the wide adoption of MDA. This paper presents an executable meta-modeling language xKL design method and a mapping method from xKL to the Java language. metaKernel based on CMOF model is the core of xKL language, which enriches its data types by expanding DataType element, increases expression types by adding ExpType element, improves Operations by adding a variety of basic action information. metaOCL expanded from metaKernel can express constraints between elements. Model mapping tool metaMap provides mapping method from xKL language to Java language and illustrates the mapping rules. The created domain model using xKL language can be directly mapped to the target language using metaMap, so the domain model will never become obsolete if technology changes, and can be developed and reused continuously.