The DIIS-MIPS coupling exhibits two noteworthy characteristics: the double-helix characteristic and the integrative inclusiveness characteristic. The double-helix characteristic encompasses the consistency, complementarity, inclusiveness, intertwined layout, replication, and stability of both the DIIS and the MIPS. The integrative inclusiveness characteristic signifies that the DIIS process convergence method incorporates the theory and operation of MIPS, while the MIPS logic layer method incorporates the theory and operation of DIIS. Regarding the research steps, the DIIS helix and the MIPS helix feature such coupling structures as decomposition structure, reduction structure, crossover structure, chain structure, staircase structure, twisting structure, interwoven structure, combination structure, sawtooth structure, run-through structure, loop structure, and rewinding structure. The DIIS-MIPS coupling process involves disciplinary knowledge coupling, which has different structures such as linear coupling, structural coupling, constrained coupling, and composite coupling. In the practice of think tank research, there are limitations for the research relying solely on DIIS helix or MIPS helix. It is necessary to make the two helixes ascend at the knowledge level, iterate the coupling relationship, and continuously converge to consensus in order to obtain better research conclusions.