Radio frequency(RF) wireless communication systems face issues of spectrum scarcity and access congestion. Integrating visible light communication (VLC) with RF can complementarily achieve advantages of high data rates and broad coverage. For indoor hybrid VLC/RF heterogeneous network scenarios, a joint optimization method that combines cell scaling power con trol and user association has been proposed to maximize the total system transmission rate under power and quality of service (QoS) constraints for users. By modeling this problem as a multi-variable coupled mixed-integer nonlinear programming (MINLP) optimization problem, it is effectively solved using the BARON optimization solver. The simulation results show that the integrated cell scaling in VLC/RF heterogeneous networks can achieve superior power allocation and user association, thereby enhancing the overall system transmission rate.