In this paper, the application prospect of high pressure rotary jet grouting technology in in-situ remediation of contaminated site was analyzed in the remediation demand and jet grouting technical characteristics. According to the requirements of the contaminated site in situ remediation, the improved design have been pertinently made on technological parameters of traditional double-pipe rotary jet grouting to enhance the applicability of high pressure rotary jet grouting in situ remediation of contaminated site. Moreover, field test was carried out to verify the feasibility of parameters design and provide technical references for similar projects in future.