<p><em>This study examines the impact of</em><em> marketing mix consisting of product, price, location, and promotion </em><em>on</em><em> </em><em>purchase </em><em>decision of </em><em>Pusat Penelitian Kelapa Sawit</em><em> (PPKS) in Pasaman Barat. This type of research is causative research that see the influence of product, price, location, and promotion on is purchasing decision. Respondents in this research are prospective consumers of </em><em>Pusat Penelitian Kelapa Sawit</em><em> (PPKS) in Pasaman Barat. </em><em>The sample of this research is</em><em> 62 respondents. Data analysis technique used is path analysis to know the </em><em>impact </em><em>of marketing mix </em><em>on</em><em> purchas</em><em>e</em><em> decision of </em><em>Pusat Penelitian Kelapa Sawit</em><em> </em><em>(</em><em>PPKS</em><em>)</em><em> in Pasaman Barat. </em></p><em>The results showed: (1) The product has significant effect on the purchase decision of oil palm seedlings in Pasaman Barat; (2) The price has significant effect on the purchasing decision of oil palm seedlings in Pasaman Barat; (3) The location has no significant effect on the purchasing decision of PPKS oil palm seedlings in Pasaman Barat; (4) Promotion has no significant effect on purchasing decision of PPKS oil palm seed in Pasaman Barat</em>