The study tests the cardinal utility maximization hypothesis by an experimental procedure in a framework of utility scaling approach following the psychophysical-econometric paradigm, conceived in He (Psychophysical Interpretation for Utility Measures, 2011). It reveals (i) the utility maximization can be tested and has been supported by experimental results; (ii) the utility scaling approach following the psychophysical econometric paradigm offers a new foundation to discuss the utility concept; and (iii) it is necessary to distinguish the perception utility and emotion utility to respectively describe economic choices and enjoyment choices.