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Fingerprint is the use of this principle, the electronic components and precision mechanical components to produce the combination of security products. Nothing but the most essential Fingerprint safe, convenient, stylish three aspects:I. False Accept Rate and False Reject RateFalse acceptance rate False rejection rate, and is undoubtedly one of the most important indicators, but also can be called rejection rate and error rate, there are several ways of expression:(1) of the head with a resolution of the fingerprint, such as 500 DPI .Existing optical fingerprint sensor accuracy is generally 30 million pixels , there are individual enterprises with 10 million pixels.(2) percentage of the way: for example, written on some parameters and so on.Of course, these are the parameters of various business information, whether it is 500 DPI or FRR <0.1% for the average user is just a concept, there is no rhythm guitar way to test. At present, institutions in this regard is the detection of Ministry of Public Security in Shanghai ‘s security products testing center, testing standards are “FRR should be ? 3% False Accept Rate ? 0.001%”.(3) “False rejection rate, false recognition rate” between the shift in the argument, to a certain extent, is correct, this seems in mathematics is “hypothesis testing” concept: at the same level, refusal true rate, false recognition rate is low, and vice versa. This is the inverse relationship. But why say that to a certain extent it is correct, because if the process and technology to improve it, these two indicators can be down, so in essence is to improve the technical level. Some manufacturers in order to speed up the certification, by reducing the level of security practices at the expense of the expense of safety, to create fast, strong ability to identify false impression.