In this paper, temperature-sensitive PET fabrics were prepared by Ar-plasma-induced simultaneous grafting Ploy-N-isopropylacrylamide (PNIPAAm) onto PET fabric. Fourier transform infrared spectroscopy (FTIR) was used to identify the structure of the grafted fabric. Then the surface morphology of the grafted fabric was observed from scanning electron microscopy (SEM) and AFM. The results show that the PNIPAAm was grafted onto PET fabrics, respectively. The grafted PET fabrics are characterized by differential scanning calorimetric analysis (DSC). The DSC analysis results indicated that LCST value of the grafted fabric was around 32°C. And the water permeability of the grafted sample showed a sharp change around 32°C. It was proved that grafted fabric was sensitive to temperature.