Abstract: Valency grammar focuses mainly on studying the deep semantic structure of sentences through analyzing predicates and attaches emphasis upon the dependent relationships between predicates and cooperative elements.Now the grammar is an edged tool to solve the problem of semantic analysis.The valency-based dictionary of English adjective (or VDEA) constructed in this study is a machine-readable dictionary based on valency grammar.VDEA covers 3170 English adjectives and relevant semantic information such as valency relationships,case relationships,explanation,commendatory and derogatory meanings,semantic classification,semantic features and examples etc.Based on the dictionary,the study designed a lexical sentimental orientation analysis model.The experimental result is satisfactory.

Key words: Valency grammar,Adjective,Knowledge base,Sentimental orientation