Shandong Univ, Jinan 250100, Peoples R China
; CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
In the angular distribution measurement of psi' -> p (p) over bar, the sample of J/psi -> p (p) over bar selected from 58M J/psi events with high statistics is used to determine the polar angle dependent efficiency, and to correct the Monte Carlo efficiency in psi'' -> p (p) over bar. The systematic error of this method is also analyzed. The obtained efficiencies and related errors are used for the measurement of angular distribution of psi' -> p (p) over bar.