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An approach to the coning error evaluation is presented in this paper. Firstly the initial point is calculated based on semi-cone angle and fitting cone axis obtained from fitting circle. Then, this paper puts forward a concise and visual model based on adaptive cone and proposes a solution of coning error base on sequential quadratic programming. Finally, the result of calculation based on many examples indicates that the initial point improves the evaluation of coning error. [ABSTRACT FROM AUTHOR]