As known to all, ovarian cancer ranks the most lethal of the gynecological malignancies. The antitumor drugs based on platinum are first-line chemotherapy drugs for ovarian cancer. However, their therapeutic efficiency is severely limited owing to dose-limiting toxicities of platinum. New theranostic strategies to overcome chemotherapy toxicity is highly desirable. Meanwhile, the real-time treating effect is not visible for doctors. Herein, we constructed PFH/siRNA/Fe₃O₄@Pt(IV) NPs-cRGD (NPs-cRGD) for precise theranostics against ovarian tumors with real-time imaging. The NPs-cRGD had a good storage stability and resisted the serum-induced aggregation, which was beneficial for drug delivery. Additionally, gel-retardation assay demonstrated that the NPs-cRGD exhibited great protection to siRNA to resist nuclease degradation. In vitro, the NPs-cRGD showed good dual-mode US/MRI imaging and the relative imaging research was also discussed. Moreover, the in vitro experiments indicated that the NPs-cRGD with US exhibited excellent antitumor therapeutic efficiency, resulting from the cRGD ligands and US exposure enhanced the cellular uptake efficiency. Thus, the dual-mode nanoparticles in this work may provide precious insight into the development of various multi-mode nanoplatforms delivering drugs or genes for precise theranostics against various cancer.