Appearing gagman on various ads are presently experienced in domestic market both high involvement and low involvement products ads. Therefore, this research attempts to analyze the effectiveness of using gagman ad model in terms of building brand preference and purchasing intention among target audience. Results of this study proposed the basement of practical use when gagman is selected as a ad model in the field. For testing hypotheses attractiveness, reliability, like/dislike as dependent variables and as independent variable purchasing intention were selected. The result of analysis shows that for high involvement product reliability influenced on brand like/dislike and attractiveness of gagman model is effective to enhance purchasing intention. For low involvement product only like/dislike was significant. This can be interpreted gagman ad model is useful for building brand like/dislike and purchasing intention of high involvement product when gagman has reliability and attractiveness respectively, while for low involvement product, like and dislike is the only variable to be considered in choosing gagman ad model.