Abstract: Meta-language is a concept shared by human language and machine language,whose inherent regularity can be externalized as the expressions similar to the ones in natural sciences.Based on the understanding,the meta-language in EFL classroom should hold the characteristics of meta-language and comply with the rule about the interaction of various factors in teaching,and its expressions should be optimized in three aspects:the objectives,the content and the form,so as to push the standardization on classroom meta-language by the idea of its formulation.

Key words: meta-language, meta-language in EFL classroom, optimization