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Surface tethered weak polyelectrolytes can respond to stimulus by swelling or collapsing and will induce a local tensile stress to the gel/substrate interface, which could be as large as up to nN/chain to break the Au/S or Au/Au bond.In view of this, we setup up an intrinsic model to systematically evaluate the correlation between in-situ force distributions via SERS.We synthesised a responsive polymer coating, via surface initiated polymerization from a thiophenol initiator modified on a gold nanostructure substrate.The gold nanostructure provides an enormous electromagnetic field enhancement of the SERS signal, while the thiophenol in the initiator serves as the SERS probe with a high intensity and to reproductively sensing the mechanical stretching associated to the polymer swelling.SER spectra revealed vibrational shift and intensity increase in accord with the controllable polymer stimulated swelling.Quantitative correlation between the spectral variation and force intensity are determined to develop SERS into a valuable tool in mechanochemistry.