This project is to 「investigate the probes for the applications in the high frequency and high speed IC testing system」. We would design three different types of probes for high frequency and high speed IC testing system, including pitch 0.3, 0.4, and 0.8mm. We use the Agilent’s Advanced Design System software to simulatie of three different types of probes for high frequency and high speed IC testing system.The tests of the semiconducting devices can be divided into the chip probe (CP, test before package) and final test (test after package). The wafer level chip scale package (WLCSP) is one kind of CP and it has the merit of reducing the package size, which can match the market development. This investigated technology is to 「investigate the probes for the applications in the high frequency and high speed IC testing system」.The tests of the semiconducting devices can be divided into the chip probe (CP, test before package) and final test (test after package). The wafer level chip scale package (WLCSP) is one kind of CP and it has the merit of reducing the package size, which can match the market development. This project is to 「investigate the probes for the applications in the high frequency and high speed IC testing system」.