Distinct signatures are present in the circum‐Pacific continental margins (e.g., kinematics, magmatism, and basin evolution), possibly influenced by the input of mid‐ocean ridge. It remains enigmatic why the circum‐Pacific continental margins that have experienced trench‐parallel mid‐ocean ridge subduction show diverse geological evolution. Here we present geodynamic modeling results investigating trench‐parallel mid‐ocean ridge subduction and demonstrate two distinct types of model evolution. Type‐Ⅰ model includes a two‐stage steep subduction and is featured by slab detachment preceding the arrival of ridge at the trench. Type‐Ⅱ model is marked by a continuous flat subduction of mid‐ocean ridge with the opening of a slab window beneath intracontinental lithosphere. These two subduction styles produce diverse tectono‐magmatic responses. Our results could explain the magmatic gap and forearc uplift during the Izanagi‐Pacific ridge subduction and the intraplate magmatic flare‐ups and tectonic uplift during the Nazca‐Antarctic ridge subduction, respectively. Plain Language Summary Mid‐ocean ridge subduction potentially occurs during the evolution of all subduction zones and has significant influence on subduction dynamics and the related geological evolution. The circum‐Pacific domain that has experienced trench‐parallel mid‐ocean ridge subduction shows contrasting tectono‐magmatic evolution. However, it remains poorly understood how the input of mid‐ocean ridge in subduction zones affects the geological evolution of these continental margins. Here, we conduct a series of numerical experiments and reveal two distinct subduction styles. The modeling results show that an interruption of ridge subduction can induce magmatic quiescence, forearc mid‐ocean ridge basalts, and forearc tectonic uplift, whereas the continuous ridge subduction can induce magmatic flare‐ups and tectonic uplift in intraplate region. These two contrasting models are strongly dependent on subducting slab dips. This study provides a new simple model to explain the complex Cenozoic geological evolution observed in the northwest and southeast Pacific continental margins. Key Points Geodynamic modeling reveals the dynamics of trench‐parallel mid‐ocean ridge subduction affected by the dip angles of the subducting slab Steep subduction promotes slab detachment along the ridge axis, but flat subduction facilitates continuous subduction of the ridge Model results could explain the contrasting geological features observed in the northwest and southeast Pacific continental margins