RF engineers and packaging engineers are facing the challenges to make electronic products with high density, high stability and high functionality. Low Temperature Co-fired Ceramics(LTCC)technology is a technique to solve this problem.In this thesis, the characteristics of LTCC technology and modeling flow of LTCC process passive components are introduced. Based on the capacitor physical structure, a reconfigurable high frequency capacitor model is established and the formulas to calculate the model parameters are given. The model indicates that two-layer model of the equivalent circuit can be accurate at 4GHz, and the four-layer model accurate at 2GHz. By using S parameter, the modified-Πequivalent circuit of plane spiral inductor and the method of parameters extraction are established. The effective value of inductor, the coupling capacitor, the high-resistors and quality factor Q are analyzed with HFSS software under different conditions such as different line widths, spaces and loops. A corresponding model library which equivalent circuit can be accurate at 7GHz for LTCC plane spiral inductor is established to ADS software. A new filter design process which successfully applied to 4GHz low-pass filter is established by using the proposed capacitor and inductor model.