The article deals with the unusual functions of content words in the texts of the Tang Dinasty. The texts guwen, chuanci and bianwen are chosen for analising. Unusual functions was one of the basic features of the Old Chinese. The language of the texts of the Tang Dinasty is often mixed of wenyan and baihua. According to the analising it becomes obvious that most various unusual functions are in the texts written on wenyan, and, in opposite, in the colloquial language there is not such diversity. Conclusion are supported by the examples from the texts.