Disclosed is a probe card assembly including a main body, a probe base provided at a center of the main body, and a plurality of test probes connecting the main body and the probe base. Therein, each of the test probes has a tip extending out from the probe base for contacting and testing a wafer. The test probes include at least one power probe, at least one grounding probe and a plurality of signal probes, wherein each of the test probes has a middle section between the main body and the probe base. Each of the power probe and the signal probes further contains therein a core that is wrapped by an insulation layer.