The point of this exploration was decides the economic advantage of intercropping Indigofera zollingeriana (Iz) and Pennisetum purpureum (Pp) based on land equivalent ratio. This experiment was led by Completely Randomized Design (CRD) with four treatment mix of establishing space, Iz with establishing space (1) 1.0m x 0.75m, (2) 1.0m x 1.25m, and Pp with establishing space (1) 1.0m x 0.5m, (2) 1.0m x 0.75m. Data collections were analyzed by disagreement analysis of variance and HSD test. The variables measured were land equivalent ratio (LER) and advantage economic ratio (AER). The results showed that planting space treatments had significant differences (P<0.01) on LER, and AER. The HSD evaluation showed that Iz was the predominant in many combinations establishing designs intercropping, Iz with extension 1.0m x 1.25m and Pp with extension 1.0m x 0.75m have highest LER and AER. It conclusion, that intercropping Iz with extension 1.0m x 1.25m and Pp with extension 1.0m x 0.75m are the most suitable based on LER and AER.

Keywords : advantage economic, indigofera, pennisteum, planting space.