To investigate the irradiation resistance of the microwave sintered contaminated soil samples, the samples were irradiated with 0.5 MeV He2+ ions. The property changes of the irradiated samples were investigated. After irradiation, the Vickers hardness values of the samples showed a relatively low degree of decrease, with a maximum reduction of 1.36%. The magnitude of NLCe of samples before and after irradiation was in the order of 1 × 10–5 g·m−2·d−1. This result will provide a useful reference for the treatment of the contaminated soil. [ABSTRACT FROM AUTHOR]