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A new turn-on probe (<b>SWJT-20</b>) based on isophorone fluorophore for the detection of nerve agent mimic diethyl chlorophosphite (DCP) was designed and synthesized. <b>SWJT-20</b> could rapidly respond to DCP within 2 s using UV-Vis or fluorescent spectra, accompanied by a significant change in the solution color under visible light or UV light, which could be observed by the naked eyes. The detection limit of <b>SWJT-20</b> to DCP was as low as 8.3 nM, which is lower than those of most reported fluorescent probes for DCP detection. Additionally, <b>SWJT-20</b> could quantitatively measure DCP using ratio changes in A₄₂₇/A₆₄₅ in absorption spectra. Furthermore, facile paper as sensors with the visualization of colorimetric/fluorometric responses based on <b>SWJT-20</b> has been fabricated. Notably, this probe could detect DCP vapor through gas diffusion experiments.