Aiming at the problem of frequent switching due to transient link changes in the heterogeneous network of indoor Visible Light Communication (VLC) and Radio Frequency (RF) communication, a decision-making mechanism based on spatio-temporal characteristics for VLC/RF networks are proposed in this paper. Firstly, in the offline sampling stage, the database is constructed by processing and converting feature data such as spatial location, bandwidth, received signal strength, delay and signal-to-noise ratio of indoor grid points into proportional weights in the controller. Then, in the real-time decision-making phase, the terminal feeds the collected feature data back to the controller to determine the location of the user terminal by comparing it with the information in the database of the controller, and the prioritized link of the current location in the database is extracted and connected. Finally, the link decision model is used to derive the network communication index in real time, and the optimal link is solved by aggregating the proportional weights of the links in the database with the network communication index through the decision function, and the communication quality is improved using the resident timer. Simulation results show that this paper's switching algorithm effectively reduces the average number of switching times and switching interruption probability compared with the traditional fuzzy logic switching algorithm and the vertical switching decision algorithm with equivalent Signal-to-Noise Ratio (SNR). The algorithm in this paper can realize intelligent management of indoor heterogeneous networks and improve the quality of user experience.