“value” not only is the philosophy domain important category,also is the economic domain basic category,is in the everyday vocabulary a frequency of use quite high glossary。Then what is “value”? This article from the historical evolution angle to the philosophy value category,with current carried on the objective theory of value,the subjective theory of value and the relational theory of value from three angles of view which the analysis formed has carried on the system inspection,and from the value and the value category,the value existence and the performance,the value and the value appraised three aspects to carry on the philosophy analysis to the value category。