Abstract: For a multi-cell, multi-user, massive multiple input multiple output (MIMO) system, a scheme for distributing base stations to mitigate the damage caused by pilot contamination is proposed and demonstrated under indoor millimeter wave environments. Specifically, based on the singular value decomposition (SVD) of training matrix, the transmit-receive equation can be transformed into a new equation. Analysis on this new equation shows that the performance of the system depends heavily on some parameters, which are called as "system indexes" in this paper. Based on these parameters, reasonable distances among the base stations can be calculated. For indoor millimeter wave environment, the system indexes guides us that, when the cell radius is 10 m, the distance between base station and interfering user should be approximately 40 m to 58 m. Therefore, when the distance between base stations is between 50 m and 68 m, the interference is effectively reduced. Simulation results confirm our analysis.