根據《香港終審法院條例》(第484章)第6(2)條，終審法院首席法官是司法機構之首，負責司法機構的行政管理。司法機構政務長負責就司法機構的行政管理向終審法院首席法官提供策略性支援。不論何時，司法機構政務處的首要工作是促進有利於司法機構及香港司法工作的事務。

具體來說，司法機構政務長需就以下範疇向終審法院首席法官負責：
(1) 就司法機構在香港特別行政區執行司法工作方面維護其獨立性；
(2) 向終審法院首席法官就司法機構的行政管理提供意見；
(3) 作為司法機構政務處之首：
(a) 確保法官在執行司法工作時獲提供適當支援；
(b) 對司法機構政務處轄下所有辦事處及組別施行適當管理，以確保司法機構運作暢順和各級法院的司法程序得以順利進行；
(c) 就提升執行司法工作質素方面制定政策、程序及常規；
(d) 確保財務、人事及辦公地方等資源得到妥善管理，以支援司法機構的有效管治；
(e) 與司法機構所有持份者(包括社會大眾)維持及建立合適而有效的溝通；
(f) 與其他司法管轄區的司法機關保持及建立交流；
(4) 作為與政府行政及立法機關的主要聯絡人；及
(5) 出任司法人員推薦委員會秘書；該委員會為法定組織，負責向行政長官作出司法人員任命推薦及相關事宜。

Under Section 6(2) of the Hong Kong Court of Final Appeal Ordinance (Cap. 484), the Chief Justice is the head of the Judiciary and is charged with the administration of the Judiciary. The JA is responsible for providing strategic support to the Chief Justice in the administration of the Judiciary. At all times, the priority of the Judiciary Administration is in furthering the interests of the Judiciary and the administration of justice in Hong Kong.

More specifically, the JA is responsible to the Chief Justice for the following areas –
(1) Safeguarding the institutional independence of the Judiciary in the administration of justice in the HKSAR;
(2) Advising the Chief Justice in relation to the administration of the Judiciary;
(3) Being the head of the Judiciary Administration –
(a) To ensure that proper support is provided to the judges in the administration of justice;
(b) To effect the proper administration and management of all the offices and units under the Judiciary Administration, thereby ensuring the proper functioning of the Judiciary, including the smooth operation of judicial proceedings at all levels of courts;
(c) To develop policies, procedures and practices to enhance quality in the administration of justice;
(d) To ensure there is optimal management of resources, including financial, personnel and accommodation, in support of the effective administration of the Judiciary;
(e) To maintain and develop appropriate and effective communications between the Judiciary and all its stakeholders, including the community;
(f) To maintain and develop exchanges between the Hong Kong Judiciary and its counterparts in other jurisdictions;
(4) Acting as the key liaison person in dealing with the executive and legislative branches of the Government; and
(5) Serving as the Secretary to the Judicial Officers Recommendation Commission, which is the statutory body responsible for making recommendations to the Chief Executive on judicial appointments and matters related thereto.