The limited bandwidth of Wi-Fi system makes it difficult to increase the accuracy of time-reversal positioning algorithm. When the positioning area becomes larger,calculation cost of the matching algorithm becomes more complicated which means more execution time is needed as well as more hardware sources. To solve those problems,this paper proposed a two-way method of Wi-Fi indoor positioning based on time-reversal algorithm. Firstly,it collected the received signal strength(RSS)and channel frequency respon...