In the block diagonal (BD) precoding multi-user multiple input multiple output (MIMO) indoor visible light communication (VLC) system based on singular value decomposition (SVD),the bit error rate performance of different receivers of the same user terminal is quite different,and the performance of the user terminal is limited to the worst-performing receiver.To solve above problem,this paper uses nonlinear receivers of decision feedback equalization (DFE),and proposes a BD precoding multi-user MIMO indoor VLC system based on geometric mean decomposition (GMD).For the same user terminal,different field of view (FOV) receivers to improve the bit error rate performance of user terminal,and analyze the impact of user terminal location on the bit error rate performance of user terminals.Finally,the simulation results show that the proposed system in this paper enables different receivers of the same user terminal to obtain similar bit error rate performance,improves the performance of the worst receiver and reduces the bit error rate of the user terminal.When the emission power of a single light emitting diode (LED) is 10 mW and the system transmission rate is 100 Mbit/s,user terminals can achieve the bit error rate performance of about 10－6 in 95% of the indoor area.