In the process of oilfield development, oil, gas, water and mud flow in the formation or pipe, under the conditions of ripe, oil dirties, scale or dirt would be produced. In actual production, oil and dirt were usually accompanied by the scale, so the scale trend prediction research was critical. the theoretical model of OddoTomos saturation index method, and how to make use of OddoTomos saturation index method to predict the scale in the process of production were introduced in this paper, the field scale influence on oil field, to provide theoretical basis for production in the next step were expounded and analyzed.