Abstract: Arsenic and antimony in soil have strong migration characteristics, their stabilization has always been a difficulty in the soil remediation industry. The stabilization effect experiment of arsenic and antimony was carried out in the arsenic and antimony contaminated soil at the former sites of seven arsenic plants in Hechi area, Guangxi. The effects of stabilizers on soil pH, arsenic and antimony leaching behavior and speciation in the soil were explored. The results showed that the soil pH remained in the range of 7.73 to 8.22 under the condition that the dosage of stabilized material was 10-70 g/kg. The stable efficiency of arsenic and antimony in soil was 65.4%-100.0% and 91.0%-99.7%, respectively. The largest proportion of arsenic and antimony in the soil was the residue state, which was more than 70.0%, and the smallest proportion was the non-obligate adsorption state(0-9.4%). The stabilization process of arsenic and antimony in soil is also a transformation process among non-obligate adsorption state, obligate adsorption state， and amorphous iron-aluminum oxide bound state. The results of this study can provide a reference for the stabilization and remediation of other similar high-concentration arsenic and antimony contaminated soils.

Key words: arsenic factory； contaminated soil, arsenic, antimony, leaching characteristics, speciation