Saliva and samples containing saliva were regarded as a kind of potential biological trace evidencefor individual identification in forensic science practice. In this paper, the authors have studied theDNA analysis of saliva and saliva containing samples. The results demonstrated that DNA can be extracted from saliva and saliva-containing samples. RFLPs analysis by DNA fingerprinting and PCRbased typing can be performed according to the amount of DNA extracted from these samples.

The improvement of electrophoresis for DNA fingerprinting has been carried out. The time of electrophoresis was shortened,and 1/3-1/2 of reagents were saved. The minimal amount of DNA samples for DNA analysis was 0.8?g. It is worthy to popularize and apply in practice.