Abstract: ²³⁷Np is considered a possible long-term potential threat for environment, because of its long half-life, high toxicity and its mobile nature under aerobic conditions due to the high chemical stability of its pentavalent state. Therefore ²³⁷Np is considered as one of high-level radioactive waste and need to be disposed in deep geologic disposeal repository. The chemical behavior of Np in environmental is concerned. The research on Np environmental chemistry is focus on concentration, speciation and migration behavior in the environment, especially in the deep geological environment. Recent inverstigation progress on the solubility and migration behavior of Np has been summarized in this paper. This paper focuses on research results of the solubility, hydrolysis, complexation reactions and adsorption behavior on the mineral, and then review the recent progress of adsorption mechanism research works. Some proposals for Np environmental chemistry research are also been suggested.