This study is to deduce problems and grope for its solution by investigating the general operation status about the present fire investigation in Korea. As for the problems, this study is to point out that they are application of diversion by the function of law for fire investigation, execution of individualized fire investigation by each institution, total lack of information sharing system for fire investigation, and weakness of cause investigation for arson. The reform measures are as follows: the unity of law for fire investigation, joint investigation by the related institutions, early introduction of civil fire investigation expert system, extension of special research institutes for fire investigation, introduction of system for sharing information of fire investigation, and operation of fire investigation team for cause investigation for arson.