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With the rapid development of new energy, the problem of power oscillation caused by large-scale wind farm access system has become increasingly prominent, such as the subsynchronous resonance between doubly-fed induction generator (DFIG) and fixed series compensation, which threatening the security and stability of the system seriously. Since there may not be a single type of wind turbine in the same wind farm, this paper aims to clarify whether there is interaction between different types of wind turbines in the wind farm, thus focuses on the subsynchronous oscillation (SSO) of a system that including DFIG based wind farm, direct-drive permanent magnet synchronous generator (PMSG) based wind farm and fixed series compensation. A linearization model of hybrid-based wind farm is established to analyze the influence of wind farm proportion, control parameters on the operation stability of the system. Based on the dynamic impedance model of hybrid-based wind farm, the mechanism of SSO is further revealed. A time-domain simulation model is built in EMTDC / PSCAD to verify the correctness and effectiveness of the theoretical analysis.