Mathematical modelling is the process of translating the real word problem into the mathematical problem, solving mathematical problem to get some useful results, and then these results are interpreted in the language of real world. Modelling consists of writing in mathematical terms what is first expressed in words, using variables where necessary. Mathematical models are used in the natural sciences , engineering as well as in the social sciences. Statisticians, operations research analysts, and economists use mathematical models hugely. A model may help to explain a system and to study the effects of different components, and to make predictions about the problem. In this paper we shall discuss about the mathematical modelling and its use in ecology..