Government
Type: Federal parliamentary democracy with a constitutional monarch. Independence: August 31, 1957. (Malaya, which is now peninsular Malaysia, became independent in 1957. In 1963 Malaya, Sabah, Sarawak, and Singapore formed Malaysia. Singapore became an independent country in 1965.).
Constitution: 1957.
Subdivisions: 13 states and three federal territories (Kuala Lumpur, Labuan Island, Putrajaya federal administrative territory). Each state has an assembly and government headed by a chief minister. Nine of these states have hereditary rulers, generally titled "sultans," while the remaining four have appointed governors in counterpart positions.
Branches: Executive--Yang di-Pertuan Agong ("paramount ruler," who is head of state and customarily referred to as the king and has ceremonial duties), prime minister (head of government), cabinet. Legislative--bicameral parliament, comprising 69-member Senate (26 elected by the 13 state assemblies, 43 appointed by the king on the prime minister's recommendation) and 193-member House of Representatives (elected from single-member districts). Judicial--Federal Court, Court of Appeals, high courts, magistrate's courts, session's courts, and juvenile courts. Syariah courts hear cases on certain matters involving Muslims only.
Political parties: Barisan Nasional (National Front)--a coalition comprising the United Malays National Organization (UMNO) and 13 other parties, most of which are ethnically based; Democratic Action Party (DAP); Parti Islam se Malaysia (PAS); Parti Bersatu Sabah (PBS); Parti KeADILan. There are more than 30 registered political parties, including the foregoing, not all of which are represented in the federal parliament.
Suffrage: Universal adult.

Government of Malaysia
Malaysia is a constitutional monarchy, nominally headed by the Yang di-Pertuan Agong ("paramount ruler"), customarily referred to as the king. Kings are elected for 5-year terms from among the nine sultans of the peninsular Malaysian states. The king also is the leader of the Islamic faith in Malaysia.

Executive power is vested in the cabinet led by the prime minister; the Malaysian constitution stipulates that the prime minister must be a member of the lower house of parliament who, in the opinion of the Yang di-Pertuan Agong, commands a majority in parliament. The cabinet is chosen from among members of both houses of parliament and is responsible to that body.

The bicameral parliament consists of the Senate (Dewan Negara) and the House of Representatives (Dewan Rakyat). All 69 Senate members sit for 6-year terms; 26 are elected by the 13 state assemblies, and 43 are appointed by the king. Representatives of the House are elected from single-member districts by universal adult suffrage. The 193 members of the House of Representatives are elected to maximum terms of 5 years. Legislative power is divided between federal and state legislatures.

The Malaysian legal system is based on English common law. The Federal Court reviews decisions referred from the Court of Appeals; it has original jurisdiction in constitutional matters and in disputes between states or between the federal government and a state. Peninsular Malaysia and the East Malaysian states of Sabah and Sarawak each have a high court.

The federal government has authority over external affairs, defense, internal security, justice (except civil law cases among Malays or other Muslims and other indigenous peoples, adjudicated under Islamic and traditional law), federal citizenship, finance, commerce, industry, communications, transportation, and other matters.
source: http://www.state.gov