Inst High Energy Phys, Beijing 100049, Peoples R China
; Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China
Most recently, both BABAR and Belle experiments found evidences of neutral D mixing. In this paper, we discuss the constraints on the strong phase difference in D-0 -> K pi decay from the measurements of the mixing parameters, y', y(CP), and x at the B factories. With CP tag technique at psi(3770) peak, the extraction of the strong phase difference at BES-III is discussed. The sensitivity of the measurement of the mixing parameter y is estimated in BES-III experiment at psi(3770) peak. Finally, we also make an estimate on the measurements of the mixing rate R-M.