Objective To provide an anatomic evidence for the suture anchors treatment and reconstruction of deep posterior tibiotalar ligament ,the distal insertions of deep posterior tibiotalar ligament were measured. Methods We studied 30 cadaveric ankles. The insertions of deep posterior tibiotalar ligament were exposed, and their sizes and locations were measured and localized. Results Deep posterior tibiotalar ligament was a constant,and the widest and thickest deltoid ligament. It originated from posterior colliculus and,intercollicular groove of medial ankle, and inserted onto the postermedial talus.The distal insertions were not quadrangular. The areas of distal insertions were（111.74±19.97）mm². ConclusionThe anatomic characteristic of the distal insertion of the deep posterior tibiotalar ligament was revealed, which provides anatomical basis for surgery.