According to the standard data mining process, CRISP-DM, one can directly collect data that are essential and useful for the mining results. It also offers practical help to those KD researchers both from industry and academia. In this paper, a KD procedure and method of E-marketing is discussed thoroughly, and a simple operating and easy understanding process model is presented to marketing people with little data mining background. In addition, the traditional market research methods are highly subjective; it is difficult to support the objective marketing decisions. While the KDDM process model can be effective in helping market analyst find the distribution and propensity of customers, thus to predict customer needs, determine the marketing strategy and ultimately to develop effective marketing plans.