Subsynchronous Resonance (SSR) is a potential problem in power systems having series compensated transmission lines. Flexible AC Transmission Systems (FACTS) Controllers are widely applied to mitigate Subsynchronous Resonance (SSR). A long transmission line needs controllable series as well as shunt compensation for power flow control and voltage regulation. This can be achieved by suitable combination of passive elements and active FACTS controllers. In this paper, series passive compensation and shunt active compensation provided by a static synchronous compensator (STATCOM) connected at the electrical center of the transmission line are considered. It is possible to damp subsynchronous resonance (SSR) caused by series capacitors with the help of an auxiliary subsynchronous damping controller (SSDC) on STATCOM. The objective of this paper is to investigate the SSR characteristics of the system and mitigation of SSR with STATCOM SSDC. The analysis of SSR with STATCOM is carried out based on Eigen value analysis. The study is performed on IEEE First Benchmark Model (FBM). © Research India Publications.