Abstract: The influence of several parameters including voltage, time, acidity, interelectrode distance and plating pen movement speed on the plating efficiency were investigated using homemade equipments, and the optimal parameters with the efficiency better than 85% were confirmed. Using those parameters, ⁹⁰Sr-⁹⁰Y β radioactive sources with sizes of 300 cm² （13 cm×24 cm）, 600 cm² （15 cm×38 cm） and 1 000 cm² （25 cm×38 cm） were prepared. The results show that the uniformity of the sources is better than 10%, and the well stability indicates the potential application for the calibration of surface contamination meters.