The embodiment of the invention provides a method and a system for testing filtration performance. The method for testing the filtration performance comprises the following steps: acquiring test parameters of the filtration performance of the uniform resource locator (URL) of a first router; and determining the filtration performance of the first router according to the acquired test parameter ofthe filter performance of the URL of the first router. The embodiment of the invention realizes the improvement of test precision of filtration performance of URL of the router; and compared with theprior art, the embodiment of the invention has lower requirement on the performance of the test device and saves cost under the requirement of the same test precision.