In the trusted computing platform, trust is typically established solely based on software measurements. Few works consider the trust of platform hardware. However, hardware trust is pretty important to a trusted computing platform. In this paper, we propose the notion of measuring hardware trust and introduce the defintion of hardware integrity measurement, which is similar to the software integrity measurement required by the Trusted Computing Group. Its purpose is to collect and measure integrity of the whole platform hardware devices. Thus, to measure and collect integrity information of platform hardware devices, we propose the hardware integrity measurem-ent protocol and analyze how the protocol could defend those attacks. Finally, we conclude that trust of platform hardware is pretty important, and shares of research attentions are deserved.