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Keystroke rhythm is an identity authentication technique which takes persons behaviour characteristics as basis. In this paper, the PR-RP model were analysed, in which four critical dataset were choosed. P-P and R-R relay dataset were rebuilt, and were processed only through using characteristics of some user entering password. And then, so as to improve the recognition rate of authentication, a new characteristics template was built and real-time updated, which make the data in template always to be the latest charateristics. In consideration of the above matters, this paper presents an Improved PR-RP Model. The experimental results show that this model can get satisfactory effect.