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Organic thin-film transistor memory based on nano-floating-gate nonvolatile memory was demonstrated by a simple method. The gold nanoparticle that fabricated by thermally evaporated acted as the floating gate. Spin coated PMMA film acted as the tunneling layer. A solution-processed ambipolar semiconductor acted as the active layer. Because of the existence of both hole and electron carriers in bipolar semiconductor materials, it is more conducive to the editing and erasing of memories under positive and negative pressure. The memory based on metal nanoparticles and organic bipolar semiconductor shows good read-write function.