Scientific visualization is a multidisciplinary technology, which integrates computer graphics, data mining, human-machine interface theory, and combines with the applied sciences, and provides an intuitive way to show valuable data in engineering area, and provides means to operator for exploring and studying physical phenomena. In recent year visualization techniques are used more widely in power system, more and more showing means is provided, and visual effects is also getting better, but these can't meet high demand of dispatcher in power system. How to make visualization technology more practical is a difficult problem needed to be urgently solved. This paper proposes several methods for practical research in visualization. Based on application already deployed in power system, we analysis the way how to improve practicality of scientific visualization in the power system, and introduce how to use visualization techniques for advanced application in power system. The practical research in this paper is helpful to raise the level of dispatching in power grid and provides strong technical support for changes from traditional dispatching to intelligent dispatching.