The invention provides a parameter self-adaption network security posture quantitative evaluation method. The method comprises the following steps that a network security posture sensing system is established; posture elements are acquired; the posture elements are subjected to standardization processing and weighted processing; the weights of the posture elements are dynamically adjusted. According to the method, the acquired posture elements are comprehensive and comprise the six aspects of anomaly traffic flow, network attack, Trojan viruses, host loopholes, resource consumption and network operation from the angles of flow and a host. Relevant parameters are dynamic and can be dynamically adjusted along with variation of network environments and security demands, the variation condition of the network security postures can be reflected accurately, and a dynamic adjusting algorithm has high efficiency.