With the transformation of the global energy structure and the increasing emphasis on environmental protection, offshore wind power, as an important renewable energy development method, is rapidly developing. Self elevating platform ships play an important role in the construction of offshore wind farms. However, the construction and operation of self elevating platform ships are influenced by various factors, such as ocean environmental conditions such as wind speed and waves, as well as the structural design parameters of the platform. The uncertainty of these factors has a significant impact on the dynamic response of the platform. This article is based on the Fangchenggang offshore wind power project and establishes a finite element model of a self elevating platform ship in ABAQUS. The wind, wave, and current loads with a 100 year return period are calculated, and the Turkstra superposition criterion is used to analyze the effects of different environmental load parameters and platform sizes on the structural dynamic response. The research results indicate that there is no resonance risk between self elevating platform ships and waves; The dynamic response of the structure increases with the increase of wind speed and wave height, and decreases with the increase of wave period; The sensitivity of the structure to different size parameters varies greatly. The structure is more sensitive to the distance L1 along the long axis of the pile leg, but less sensitive to the distance L4 from the pile leg to the platform width; When the load is applied in different directions, the influence of size parameters on the dynamic response of the structure also varies. The research results of this article provide scientific basis for the design and improvement of self elevating platform ships, and have important theoretical significance and application value for the design and dynamic response control of self elevating platforms.