Abstract: The sensor deployment has density, uneven distribution, DV-Hop algorithm error is high, this paper proposes a improved DV-Hop positioning algorithm for wireless sensor network. Firstly, DV-Hop algorithm is used to localize the unknown sensor node position, and then the genetic algorithm is used to correct the DV-Hop positioning error. The experiment results show that the proposed algorithm improves the positioning precision, it can reflect the actual distribution of sensor network node.