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Various soft materials share some common features,such as significant entropic effect,large fluctuations,and sensitivity to thermal conditions.Until now,no quantitative definitions have yet been provided for soft matter,and the intrinsic mechanisms leading to their common features are unclear.In this talk,with the aid of an appropriately chosen order parameter,I will define a "moderate point",at which a thermodynamic system has balanced entropy and enthalpy contributions among its microstates and the order parameter fluctuation maximizes.Moreover,the maximization of the associated response function explains the sensitivity of the system to thermal conditions.Soft materials are believed to work in the vicinity of the moderate point.The relation between the moderate point and the so-called "Widom line" as well as a primitive application of this theory to biomachines will also be discussed.