: Siak we know as one of the potential of its natural resources and is also known as one of the tourist destinations in the province of Riau. Siak economic development based on the needs of natural resources and human resources potential, and therefore the potential need to be managed and utilized as it can make a major contribution to the country to attract investment and create jobs. their investment will encourage the creation of new capital goods that will absorb the new production factors that create jobs kerjabaru or jobs that will absorb labor, which in turn will reduce unemployment. Based on what has been described, permasalahandalam principal investigator of this study is to formulate, Barapa big is the role of domestic and foreign investment to absorb the demand for labor in Siak. After all necessary data are collected, processed, and then analyzed using descriptive methods based on the theory, models and the various opinions of experts who have been generally accepted according to the issues discussed. The results showed Siak is one of the potential of natural resources, the greatest potential Siak Regency is agriculture and farming, Foreign Direct Investment (FDI) that occurred during the past five years amounted to Rp 7,508,886,293,818, - or 43, 40% are primarily involved in the industrial sector, there are two (2) companies that invest large, namely PT. Indah Kiat Pulp & Paper Tbk and PT. Pindo Deli Pulp & Paper Mills is able to absorb the labor force sebanya 22 168 people or 13.41%. Domestic Investment (DCI) in the last five years amounted to Rp 9,839,746,586,566, - or 56.60%, which is engaged in the agricultural and plantation sectors manufacturing sector capable of providing employment for 143 172 people, or 86.59%.