In this paper, the authors analysis the capacity of the clustered network Multiple-Input Multiple-Output (MIMO) systems with overlap. They firstly propose a strategy for clustering Base Stations (BSs) for the analysis tractability. With an assumption of a large number of transmit and receive antennas, an analytical expression of the ergodic capacity using random matrix theorems is derived. In particular, they develop an asymptotic capacity in low Signal to Noise Ratio (SNR) regime. Based on that, they suggest that the number of Overlapping Degree Of Freedom (ODOF) is larger than B/6 for the sake of the capacity increment, where B refers to the total number of BSs in the multi-cell network.