With the popularization of Internet, and the vulnerabilities found continuously, network hosts meet more and more risks of being attacked. If we don¡¦t secure them well, they will become the targets of the hackers. In addition to the protection of firewalls, vulnerability scanners can also help us to find out the weekness of our network hosts. Nessus is an open source freeware which has the capability of vulnerability assessment. Nessus has very powerful scanning ability and is very easy to use. Nessus provides detailed result reports from the messages in the plugins. However, like many other freeware and software, Nessus is an English software. For this reason, Nessus provides English result reports. For those who do not use English as their first language, it costs a lot of time to read a lot of English result reports. In this research, we develop a localizational system of the Nessus scanner and provide the result reports in users¡¦ local language. We develop an automatic mechanism to extract the messages and infomations in the plugins, and put them into the vulnerability databases. We also develop two subsystems, one of them makes translators translates the message in the vulnerability database into their local language, and the other replaces the English result with those translated messages. This research proposes the design above and actually implements a localizational system of the Nessus scanner. It attempts to reduce the time and labor consumption while translating, automate the update process of vulnerability database, and avoid the modification of source code as possible.