Abstract: This paper studied the small-signal oscillation stability of a concentrated solar power (CSP) farm composed of the same CSP generators with a general network topology. Researches shows that there are two main factors that affect the stability of the CSP farm oscillation: the first factor is the dynamic contact between a single CSP generator and the rest of the farm, which determines the positive and negative conditions of the influence, that is, whether it is beneficial to stability or undermines stability; the second factor is the topology and parameters of the collection network, which mainly determines the degree of the influence. Therefore, when the first influencing factor will reduces the stability of the farm, and the second influencing factor is larger, the CSP farm has the risk of oscillation instability. The calculation example given in the article verified the conclusion of the theoretical analysis, : because the damping of the oscillation mode related to the excitation system of the CSP generator was negative, and the CSP farm had oscillation instability. In order to suppress the oscillation, this paper proposed to install a damping controller in the CSP excitation system. The structure of the damping controller was the same as that of a conventional power system stabilizer, but the design concept was completely different. The damping controller was designed for the first influencing factor, and the goal was to keepfor the purpose of keeping the first factor's influence on the oscillation stability of the CSP farm positive, thereby eliminating the risk of oscillation instability. This paper verified the effectiveness of the proposed damping controller design through simulation examples.