During 11/2005, 4/2006 and 1/2013 year, the fauna of brackish water nematodes in Can mangrove forest had been investigated. Twenty stations located in the transfer zone, aquacultural zone polluted industrial zone and core zone had been chosen. A total of 125 species belonged to 77 genera of 25 families were recognized. The family Xyalidae was highest proportion with a total of 19 species (15.2 percent), followed by Leptolaimidae with 17 species (13.6 percent), Comesomatidae (12 percent), families Oxystomidae and Linhomoeidae less percentage (respectively is 8 percent and 7.2 percent). The results showed that 12 nematode species as the new species for science which tow new species were described and will be published in the end of 2013.