Abstract: Database Scmantics(DBS)，initiated by Prof. Hausscr in 1990’s as a linguistic framework for computational modeling of natural language communication, treats the agent' s switching back and forth between the speaker and the hearer mode as a well-defined and well-motivated computational problem. As a procaiural approach aiming at a systematic general model of cognition, differing from those etalanguagcbased theories, DI3S has two innovative basis, namely,the time-linear motor algorithm of LA-grammar(Left Associative grammar) and the data structure of word bank.With its application to the ancient Chinese as an example, we attempted to provide an introduction to the DBS under-standing and production of natural language in the sense of the functioning of three LA-grammar variables, i. e.，LA-hear, LA-think and LA-speak.

Key words: Natural language, Syntactic and semantic analysis, LA-grammar, Database