Connect6 is an emerging chess game in recent years. It evolves from Renju or Go-Moku. Because of large board, the search space and the state space are very large and the efficiency of searching algorithm is higher than Renju or Go-Moku’s. This paper mainly introduces key technologies of Connect6, such as board representation, move generation, searching technology and evaluation function, etc. Machine learning is used in the Connect6 computer game program. Hot topics and tasks are also proposed in the end.