Over the last decades field ecologists are more and more interested in understanding deeper biological questions, for instance: 1) the links between evolutionary and ecological dynamics. 2) For an important trait, to what extent determined by genes (as the degree of heritable reflecting the trait′s evolutionary potential)? 3) How do genes influence phenotypes, fitness and population dynamics? 4) How is the genetic correlation between important traits? As the development of biological statistics, especially the mixed effect model, combined classical theory of quantitative genetics, a professional model (Animal Model) provided us opportunity to carry out robust studies on wild populations. In this review, we introduce some basic conceptions of classical quantitative genetics, and then, by using typical examples, we focus on how to use the Animal Model. Finally, we discuss the future of integrating quantitative genetics and evolutionary ecology in the wild.