The invention discloses a DHCP Offer flooding simulation method. The method comprises the following steps: a test host establishing a DHCP Offer packet; a router to be tested requesting an IP from a test accompanying router through a concentrator, and breaking connection between the test accompanying router and the concentrator at half of time of the leasing period of the obtained IP; the test host sending numerous DHCP Offer packets to the router to be tested through the concentrator; the test host determining whether the router to be tested obtains source IPs in the DHCP Offer packets, and if so, determining that a DHCP function of the router to be tested is abnormal; and otherwise, stopping sending the DHCP Offer packets, re-establishing connection between the test accompanying router and the concentrator, determining whether the router to be tested obtains the IP sent by the test accompanying router, if so, determining that the DHCP function of the router to be tested is normal, and otherwise, determining that the DHCP function of the router to be tested is abnormal. According to the invention, the condition of tensed current test environment resources is solved.