Basic principle and technologies of direct fabrication of resistor on glass structure by micro-fine cladding were introduced in this paper. The effect of technologic parameters on resistance values was systemically studied. Based on the thermal analysis and interacting principle between laser and matters, formation of esistance films and relation between structure and properties were theoretically analyzed. The optimal technologic parameters about direct writing resistance and the optimal testing method of high-precision and small-error resistance values were obtained. The results demonstrated that laser micro-fine cladding method by one-step can realize fabrication and repair of high-quality, high-precision and high-property resistance components without mask in virtue of shape, size and volume of resistance and laser processing parameters adjusted, and need not to trim resistances. With the simple and flexible technology, rapid velocity and low cost, the technique is possessed of wide applied prospect.