 The study proposed a new coding method called multi-symbol time-division coding, MSTDC, which is capable of encoding multiple targets with limited frequencies and phases of stimuli. This method can be easily extended to other systems and reduces the cost of collecting training data. As a result, it is a promising technique for achieving a comfortable brain computer interface, BCI, with multiple targets while maintaining a high information transfer rate. This article was offered by Xiao Chenyi, Chen Yang, Yonghao Chen, and others.