The purpose of this study is to determine the base sector of Siak Regency, the pattern of economic growth in Siak Regency, and to know how the changes of economic structure in Siak Regency on the periode 2010-2017.The type of data used is quantitative secondary data obtained from Badan Pusat Statistik (BPS). The method of data analysis used Location Quotient (LQ), Klassen Typology, and Shift Sh…