Huixiangdou is a domain-specific knowledge assistant based on LLM that can handle complex scenarios in group chats and answer user questions without causing message overload. It provides an algorithm pipeline to answer technical questions and has low deployment costs, requiring only that the LLM model meet four characteristics to answer most user questions. Huixiangdou can handle various questions in its operational scenarios and welcomes joining their WeChat group to experience the latest version.