This invention relates to a recycle developing method which comprises developing an electrostatic image formed on a photosensitive material with a starting developing agent filled in a developing vessel to form a toner image, transferring the toner image to a predetermined paper, recovering the toner remaining on the photosensitive material by a cleaning means, and repeating the development while replenishing the virgin toner and the toner recovered by the cleaning means into the developing vessel; wherein the average charge quantity of the toner in the developing agent containing the recovered toner is prescribed at a value greater than the average charge quantity of the toner in the starting developing agent plus 10 µC/g. By this method, an abrupt decrease in the charge quantity of the developing agent due to the mixing of the recovered toner is relaxed, and as a result, a stable image free from fogging or toner scattering can be formed.