A training course on Tropical Forest Ecosystem was conducted by INSTeG on 29 – 30 Jun 2013. This training course was attended by twenty two participants that comprised of Research Assistants and Research Officers from Tropical Peat Research Laboratory, Kuching Sarawak. The main objective of this course is to introduce participants with basic concepts of ecosystem with particular reference to the tropical forest ecosystem. The definition of various terms related to ecosystem was introduced to enhance participants understanding related to ecosystems. Apart from the basic concepts, participants also learned important aspects of ecosystem such as the structure, process and functions. This course also introduces basics concept of geochemistry with the main focus on geochemical cycles. Life composed of many chemical elements, which exist in the right amount, the right concentrations, and the right ratios to one another. If these conditions are not met, then the life is limited. The study of chemical availability and biogeochemical cycles is important to the solution of many environmental problems. As ecosystem is a dynamic system and changes to the system are normally have an important impact on Earth environment, an ecosystem, therefore, need to be properly managed. Thus, this is not complete if topic on ecosystem management is not included. One of the important tools in management of an ecosystem is the use of new technologies such as remote sensing and geographic information system (GIS). Basic concept and application of these new emergence technologies are also included in this training course. This two days course was conducted by Assoc. Prof. Dr. Ab. Latif Ibrahim and was assisted by Mr. Tam Tze Huey. Contents of the lectures include; Ecosystem: Basic Concept, Ecosystem Structure & Function, Inputs and Outputs of Nutrients to Ecosystems, Ecosystem Change and Succession, Ecosystem Management, and Application of Remote Sensing to Ecosystem Study.