The vivax malaria was re-emerged in northern part of Kyonggi-do, rescently. Anopheline mosquitoes were analyzed with polymerase chain reactions to determine what kind of mosquito is the main vector for malaria transmission. The Anophetine mosquitoes were collected from 29th Aug. to 19th Sep., 1996, in epidemic areas. The areas were GOP of XX corps and Taema-ri in Chorwon-gun, Seokjang-ri, Wondang-ri, Tongiung-ri and Hyunga-ri in Yonchon-gun, Changpa-ri, Majeong-ri, Popwon-ri, Paekryun-ri, Chosan-ri and Paju-ri in Paju-shi, Saengyon-dong in Tongduchon-shi. Mosquitoes were collected by dry ice method from 19:00 to 07:00 on next morning. Total 5,615 Anophetine mosquitoes were collected and identified into species based on taxonomic criteria. As a results of classification, 4,866 An. sinensis (86.7%), 561 An. yatsusiroensis (9.9%), 112 An. pullus (1.9%), 58 An. sineroides (1.0%), 12 An. lesteri (0.2%), and 6 An. koreicux (0.1%) were identified. Anophetine mosquito DNA was extracted and then amplified the circumsporozoite protein gene, which is the specific gene of Plasmodium vivax, with nested-PCR method. PCR products (about 870 bp) were observed with DNA samples of mosquitoes collected in Changpa-ri and Paekryun-ri. As the results of DNA hybridization, the amplified PCR products belonged to Plasmodium vivax Pv210 type.