The broad-energy germanium (BEGe) detector,with the ability of background discrimination using pulse shape discrimination,is a competitive candidate for neutrinoless double beta decay (0vββ) experiments.In this paper,we report our measurements of key parameters for detector modeling in a commercial p-type BEGe detector.Point-like sources are used to investigate energy resolution and linearity of the detector.A cylindrical volume source is used for efficiency calibration.With an assembled device for source positioning and a collimated 133Ba source,the detector is scanned to check its active volume.Using an 241Am point-like source,the dead layer thicknesses is measured at about 0.17 mm on the front and 1.18 mm on the side.The detector characterization is of importance for BEGe detectors to be used in the 0vββ experiments at China JinPing underground Laboratory (CJPL).