助理城市規劃師主要協助執行以下職務，以及接受在職培訓，以汲取城市規劃方面的經驗：

(a) 擬備、修訂及落實全港發展策略，以及法定和非法定地區設計圖，並舉辦公眾／持份者參與活動；

(b) 直接參與或透過管理顧問的工作，從而制訂及修訂規劃標準及指引，以及進行規劃研究、調查及城市設計相關工作；

(c) 處理發展建議及規劃申請，以及為城市規劃委員會提供專業及秘書處支援服務，並就不同用途物色發展地點；

(d) 根據《城市規劃條例》對違例發展採取執管行動；

(e) 研製及應用地理資訊系統和資訊科技技術，方便公眾參與及作出決策；

(f) 就跨境及區域發展事宜進行研究，並與內地部門保持聯絡；以及

(g) 進行社區關係活動、公眾外展計劃及職員發展培訓計劃，以及處理公眾查詢。

An Assistant Town Planner is mainly deployed on assisting in the following duties and undertaking on-the-job training with a view to gaining experience in the town planning discipline -

(a) preparation, revision and implementation of the territorial development strategies, statutory and non statutory district plans, and conducting public/stakeholder engagement activities;

(b) formulation and revision of planning standards and guidelines and carrying out planning researches, studies and urban design related work either directly or through managing the work of consultants;

(c) processing development proposals and planning applications, providing professional and secretariat support to the Town Planning Board, and carrying out site searches for various purposes;

(d) undertaking enforcement actions against unauthorised development under the Town Planning Ordinance;

(e) development and application of geographic information system and information technologies to facilitate public participation and decision making;

(f) carrying out research and liaising with Mainland authorities on cross-boundary and regional development matters; and

(g) carrying out community relations, public outreach and staff development training programme, and handling public enquiries.