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<span style="font-family: 'Times New Roman','serif'; font-size: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">In the present paper, the dynamical snap-through of a preloaded micro-sensor is analyzed. This behavior is linked to analyzing bifurcation behavior of the micro structure in a suitable framework. Effects of the axial pre-stress and the excitation amplitude on the stability and sensitivity of the sensor are also discussed. In order to capture the size effects, the modified strain gradient theory is employed on an Euler-Bernoulli beam. Applying the Hamilton’s principle and utilizing the Galerkin’s method, the nonlinear governing equation for the vibration is obtained. The method of multiple scales (MMS) is then used to obtain the frequency-response equation and by using a mathematical approach, the bifurcation points and the jump heights of the micro-resonator are analyzed. The calculated analytic equation for frequency response, provides the conditions for obtaining the range of snap-through and studying the effects of different designing parameters on the multivaluedness range. T</span><span style="font-family: 'Times New Roman','serif'; font-size: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-GB">he jump height of the micro-resonator is proposed to use as a criterion for sensing purposes.</span><span style="font-family: 'Times New Roman','serif'; font-size: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;"> The simulations are illustrated and the results are verified with similar works</span>