This study explores the semantic features of FACT clauses in discourse context within the theoretical framework of Systemic Functional Linguistics. The investigation starts with the exploration of the typical process types occurring in the matrix clause of FACT clause simplex, which is helpful and necessary to display different process types which construe FACT category. Then, the study conducts from the vantage point of semantics in discourse with three semantic models: (i) positive/negative orientation model; (ii) positive/negative reaction model; and (iii) positive/negative evaluation model. The results show that the semantic models of FACT clauses are construed by different process types as well as their contextual factors.