Abstract: With the extensive application of scientific models in contemporary scientific practice, Philosophical issues related to models have become a topic of general interest. A basic problem among the concern of this article is the ontologic stance of models. By analysing three main ontologic stance of models-model as mathematical structure of theory, model as fictional abstract entity and model as tool-and their advantages and flows, this article drew a conclusion that the monistic ontological stance is not sufficient for the diversity of model kinds nor to serve as a valid premise for the epistemological problems of models. Based on this conclusion, we proposed a pluralist ontological stance of models.

Key Words: Scientific model; Ontology; Fiction; Tool; Pluralism

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