Construction of offshore structures is more complex than onshore structures in terms of structural response and its loading system. The high dependency on the environment with high level of uncertainties is the main factor that contributes to the complexity of design and construction process. Better understanding on the type of structures and load exposed to it are required to maintain the high integrity of the operation life. An overview of the design and analysis of offshore structure in the case of fixed platform will be discussed in this paper. It comprises of the fundamental principle of wave dynamic, the dominant load acting on the structure, method used to quantify the responses and probability of failure that should be considered at the design stage. It is mainly to provide understanding and guideline for the purpose of the design phase. Description in details can be obtained through further reading based on references that have been cited in the content