This paper describes the mechanism of sand fixations by grouting engineering and biological engineering . The grouting veins formed by pipe-g routing act as anchors

and adjacent grouting columns work like soil arches . The deep roots resulted from biological engineering act as anchors

and voluminous flat roots present a reinforcement effect .The authors consider that the combination of civil engineering measures with biological engineering measures can make the best of respective advantages

and thus achieve the effect of managing bothits root cause and symptoms .Finally

countermeasures on No.13 sanding-sliding slope in Zhongba section of the Sichuan-Tibet highway are briefly discussed .