Nowadays Criminalistics is acknowledged on the important parts of criminal investigation. Since Hans Gross emphasized scientific crime detection, one hundred years passed. Then the method for criminalistics was developed brilliantly. Crime investigation without criminalistics is to be the core of crime detection so much that is not acknowledged as crime investigation. Advancements in forensic DNA technology have led to a significant increase in the number of sample collected during crime scene investigations. This papers studied the knowledge and analytic method concerned to DNA fingerprints identification specifically. The true nature of DNA, the extraction and quantification of DNA, various methods of DNA fingerprints developed recently was inquired systematically. The most crucial role in the examination of biological evidence is its method of collection and preservation. The integrity of forensic evidence has always been the burden of the crime scene investigator. But in these days the methods for DNA fingerprints are more and more developed to STR (Short Tandem Repeat) multiplex PCR(Polymerase Chin Reaction) and mitochondrial DNA analysis through RFLP(Restricted Fragments Length Polymorphism). Consequently the integrity and size of biological evidence is not problem to extract DNA fingerprints. As the use and success of DNA evidence has spread throughout the criminal justice system, a new application of the technique is rapidly being adopted in many investigations. Namely low copy DNA evidence is being collected and processed in nonviolent property crimes. Formerly, DNA was sought and compared only in major violent crimes because of the necessary large quantity of blood and other biological materials needed for laboratory testing. New technique now allow criminalists to compare far fewer cells for successful match. Accordingly very minute materials like dandruff, contaminated evidence, corrupted evidence, and obsolete genetic materials can now be utilized. Also hairs without hair root can be used to extract DNA. DNA database system is utilized to identify suspects by collecting crime evidence in crime scene. Many nations with USA is establishing DNA database system. In the case of USA, the national DNA database known as the Combined DNA Index System(CODIS) expanded nationally as a result of the 1994 DNA Identification Act(Public Law 103 322) giving the FBI legal authority to establish a DNA database for the nation`s criminal justice system. Today all 50 states participate in the CODIS program, which is composed of two main DNA indices: a forensic index that contains DNA profiles developed from crime scene-related evidence and a convicted offender index containing DNA profiles from qualified convicted offenders. A convicted offender recorded into CODIS an individual who has been sentenced in guilty in court finally. In Korea, May 29th 2009 year, Korea parliament and government noticed previously the legislation concerned the utilization and protection of DNA individual identification information. A qualified convicted offender in Korean. A scope of crime contained in DNA database system is very broad to extent that includes ① murder, ② rape·sexual harrassment, ③ robbery, ④ arson, ⑤ drugs, ⑥ kidnap, ⑦ capture and confinement, ⑧ habitual violence, ⑨ organizational violence, ⑩ sexual violence against youth. A qualified convicted offender into DNA database system is prisoner sentenced in guilty from court and suspects who a arrest warrant is granted. Suspects under arrest warrant are not yet sentenced in guilty from court. Consequently this is criticized on the reason that infringe on human rights. But DNA database is effective system in crime investigation in violent crime especially.