Islamic law has existed in the territory of Indonesia since the Muslims settled in Nusantara. Based on the opinions concluded at the Seminar on the Entry of Islam into Indonesia held in Medan in 1963. In the process of Islamization in Indonesia carried out by merchants through trade and marriage.The research in this journal comes from research into library data types that focus on the analysis of existing literature. This research does not involve collecting primary data through direct observations or experiments, but rather using written sources of information such as books, articles, and scientific publications.The Surakarta Residence has a legal system that has existed since the Mataram era and the Dutch Indian Governmentins the legal system under its supervision. Law is very closely linked to other fields, especially social and economic order. Keraton Surakarta has a government structure that inherited the reigns of Mataram II, Pajang and Demak.With such authority, the process of growth and development of the courts in various sections has their own uniqueness. Integration, or living side by side between custom and shara', is a settlement of conflict that occurs latently even manifest as studied in Aceh, Minangkabau, and in some places in South Sulawesi.