Any resistance-capacitance element, its basic electrical parameter resistance value or capacitance size, all depends on the main material electrical parameter resistivity square resistance or dielectric constant and size, as well as the structure and size of the plate end. As for resistors, for resistors made of bulk materials, because R L / S, that is, the value of resistance is proportional to the material resistivity p and the length of flow l, inversely proportional to the cross-sectional Area S; For resistors made of film resistors, the value of resistance is proportional to the film resistance and the through-flow length of the material and inversely proportional to the through-flow width of the material. For capacitors, the capacitance is proportional to the dielectric constant e and the plate area S and inversely proportional to the dielectric thickness d. If, , and each line size is a function of temperature, then by Ar Dr / Rdt and AC DC / CDT, aR is the resistance temperature coefficient of the resistor, and a'r is the resistance temperature coefficient of the film resistor AC is the capacitor capacity temperature coefficient, AP is the resistance material resistivity temperature coefficient, AR, the temperature Coefficient of film resistance, the Linear Expansion Coefficient of al-based material, the temperature coefficient of dielectric constant of ae-based material, the linear expansion coefficient of am-based metal plate material and ad-based material are the temperature coefficient of film resistance.