This is a preface to the special issue on Proceedings of the Sixth Russian-Chinese Conference on Knot Theory and Related Topics which was held in Novosibirsk in June 2019.

中文翻译：

---

第六届俄中结理论及相关专题会议

这是2019年6月在新西伯利亚举行的第六届俄中结理论及相关专题会议论文集特刊的序言。