Due to the low undrained shear strength of soft soil foundation, subsea pipelines may penetrate into the seabed soil under self-weight after laying. Excessive penetration may affect the installation efficiency of the connection between the spool and the pipeline. Based on the prototype of a mudmat, a design of work platform for spool connection is proposed and applied in field in this work that can reduce pipeline penetration. Firstly, numerical models are established for the platform under lifting conditions and in-place operating conditions, and displacement and equivalent stress are analyzed under different operating conditions. The feasibility of the platform design is verified by local strength check. In addition, pipeline-soil interaction model is established for the penetration of the subsea pipeline on the soft soil foundation, comparing the pipeline penetration with and without the work platform. Field penetration data indicates that the work platform can effectively reduce pipeline penetration and i