This paper, by applying the theory of ecology to translation studies, explores the translation eco-system and its control mechanism. Generally speaking, the translation eco-system is in order and relatively stable, but it is in disorder due to some differences in its structure vertically and horizontally and to some environmental factors of uncertainty. The regular fluctuation promotes the development of translation studies while irregular fluctuation impedes the realization of the objective. Therefore, the control mechanism of translation eco-system must be fully utilized to maintain the balance of the system.