Biometric information is the information of human physiological and behavioural characteristics used for automatic identification, state analysis and attribute estimation. It has the characteristics of uniqueness, stability, easy collection and public interest. Illegal acquisition, provision and use of biometric information may constitute an infringement of others’ personal rights, property rights, public order and even national interests. The civil code clearly expresses the importance and protection of biometric information and distinguishes biometric information from general personal information, but the criminal law has not responded to this in a timely manner. Based on the analysis of the minimum uncertainty neural network (MUNN) model, this article discusses the attribution object of biometric information and gives the path of attribution of criminal law under biometric information. The empirical results show that the number of misjudgements, the recognition rate and the number of iterations of the MUNN model proposed in this study are 65, 93.5% and 1501, respectively, and the effects are all optimal. Due to the insufficient response of the criminal law to biometric information, there are differences in main charges and sentences, and the consistency is 50% and 75%, respectively.