A method for improving security of the security token, comprising the steps of: detecting the bioelectrical signal of the host user; and allowing the host to access the data stored in the security token after verifying the user. The process of detecting the bioelectrical signal of the host user further comprises the following steps of: capturing the bioelectrical signal of the user; processing the captured bioelectrical signal to produce a bioelectrical feature vector; comparing the bioelectrical feature vector with the previously stored feature vector templates; and verifying the user if the comparing result is greater than or equal to a previously specified threshold. The present also provides two embodiments of an apparatus for improving security of the security token. The present invention eliminates the security problems of the prior art and improves the reliability and security of the security token.