[Purpose/significance] The “deep web” encrypts information for privacy protection, but it was used by IS terrorists to launch attacks in Paris. Except for analyzing the utilization and regulations of the “deep web”, this paper also analyzes its detriment and proposes regulation methods of the “deep web”. [Method/process] This paper investigated the concepts characteristics and utilizations of Deep Web, especially analyzes its detriment and regulation methods and trends. [Result/conclusion] Many countries including the USA, Russia and England conduct researches on data mining and regulations of the “deep web”. The problems in this domain include the abuse of privacy and challenges in decryption. This paper proposes to regulate the “deep web” in three aspects by strengthening researches on the “deep web”, pushing legislation and making international rules.