Agricultural institutions have a crucial role in disseminating site-specific tecnology in term of supporting the development of Aceh province. This study which was conducted in March to November 2011 in the districts of Pidie, Bireuen and Pidie Jaya aimed to determine which formal and informal institutions had the largest contribution in site-specific technology dissemination. Besides, it was also to find out the model of institutional dissemination system of the existing agricultural innovation as well as soliciting feedbacks from the users. The selection of research location and the samples was conducted through purposive sampling (intentionally). From each district, three subdistricts were taken, and from each subdistrict three villages were selected. Each village comprised 20 samples, so the total respondents involved were 540 people. The result obtained from this study was the formal institutions in Pidie Jaya provided a more dominant and significant contribution in disseminating sitespecific technology innovation through a range of networks such as Aceh AIAT, Extension Agency, Agricultural Training Agency, and farmer groups. The performance of these formal institutions in Pidie Jaya was very influential on the development of site-specific agricultural innovation while the performance of formal institutions in Pidie and Bireuen was diverse. Therefore, in the future, the role of extension workers in the field is expected to be more synergistic in disseminating technology innovation.