Crustacean survey results of the 06 wards and communs in the city of Thai Nguyen area from March, 2012 to October, 2012, were identified: 36 crutacean species of 3 orders, 10 families and 22 genuses. Namely: Cladocera order has 12 species, 4 families and 6 genuses. Copepods (Copepoda) with 15 species, 3 families and 11 genuses. Ten feet order (Decapoda) with 9 species, 3 families and 5 genuses.