Abstract: In order to enhance the stability and reversibility of thermochomic materials，using melamine resin as the wall materials, and the crystal violet lactone-stearic acid and tetradecanol as the core, and adding emulsifying agent and xanthan gum aqueous solution as the protective colloid, organic thermal materials are prepared and microencapsulted. Preparation technics：the mass of emulsifier is 2%, super ultrasonic emulsified time is 30min, the ratio of core and shell is 2:1, the rate of stirring is 720r/min and the temperature of reaction is 70℃. The temperature of color changing of the microcapsule is 46℃, while the time of color changing is 25s, and the temperature and the time of color fading are 40℃ and 49s, and its color change reversibly can be effected between purple and light yellow.