Abstract: This paper proposes a biomimetic articulated chain-sphericity coordinate to record and calculate states of spatial skeleton intuitively.For the unknown joint,once states of two forward conjoint sticks are got,we can obtain the new 3D Cartesian coordinate values accurately by using length of stick connected directly and two angles in the new coordinate.The applications based on high-dimensional biomimetic informatics show that this coordinate can reflect subtle and continuous variation of spatial skeleton.Comparing with traditional ways this method has advantages of faster speed and wider application range with few parameters.It is instructive and non-redundancy.