In our present study, we firstly aim to identify the co‐varying multimodal MRI patterns in aADHD under the guidance of inhibition function, which has been suggested to be a core impairment of ADHD; Secondly, the potential genetic effects of NOS1 ex1f‐VNTR on inhibition and its related brain alterations were investigated to build a potential “gene‐brain‐behavior” relationship. Here, NOS1 is linked to attention deficit-hyperactivity disorder.