The present invention takes the piezoelectric element as a power source, the temperature can improve the insole, and achieve the effect of the foot warm. The present invention is a piezoelectric modules installed in the rear of the insole, insole piezo module by gravity on the human body, will produce electricity, the electricity passed through resistive heating modules, will produce heat. The product temperature control is good, not too high or too low, safe, and does not require additional power, no external batteries, there is sufficient flexibility; also applies to any shoes, everyone can be in accordance with the size of the foot size of the crop , comfort and convenience are very good.