A Fe-based metal-organic framework, [Fe(INAIP)(DMF)]_n·0.5nDMF (1), has been synthesized by the reaction of 5-(isonicotinamido)isophthalic acid (H₂INAIP) with FeSO₄∙7H₂O under DMF reaction solvent. Single-crystal X-ray diffraction analysis indicates that complex 1 displays a two-fold interpenetrated three-dimensional (3D) framework with sra topology. The TG, magnetic and adsorption properties of the complex were also studied.