A tunable reflecting micro-optoelectromechanical systems (MOEMS) micromirror is designed for measuring the actual temperature and color of an object based on comparison of two wavelength response windows, 3–5 and . The MOEMS micromirror with switching between two positions by an applied electrostatic voltage provides a response to two wavelength windows by tuning the optical resonant cavity. Three different structural models of the tunable micromirror, which are made up of single Al layer with type I legs, single Al layer with type L legs, and double layers with type I legs, are designed and simulated accurately using ANSYS tools on a pixel-pitch array. On the basis of the comparsion, the third model, made up of double layers with type I legs, is chosen. With different distances between the MOEMS micromirror and the bottom electrode, the total capacitance of the tunable micromirror is gained based on electromagnetic analysis and theoretical equation. The pull-in voltage is calculated as by electrostatic-mechanical coupling analysis, and the maximum stress is , which is less than the yield strength of thin film. But if the voltage is increased to , the micromirror will touch the bottom electrode by pull-in behavior.