Design method for newly-built platform orientation adopting trestle to be connected with built old platform

The invention relates to a newly-built platform orientation design method adopting a trestle to connect a built old platform, and belongs to the field of offshore oil engineering. A plurality of potential and feasible newly-built platform orientations are selected; the method comprises the following steps: respectively assuming to build new platforms in a plurality of potential feasible new platform orientations, assuming to build a plurality of new platforms on the basis of a subsea pipeline and submarine cable routing map implemented around a built old platform and a jacket chassis map of the built old platform, and adding the jacket chassis map of the new platforms for lofting; and all directions meeting the lofting requirements are screened out until lofting is completed. According to the design method for connecting the newly-built platform orientation of the built old platform through the trestle, in the face of the complex environment of the periphery of the built old platform and the built submarine p