To explore the better development parameters, 3 groups of developing temperatures and 2 groups of developing speeds are set for testing. The film-remaining rate and the blank density of CTP plates with different developing conditions were tested with the curves drawn. Through the contrast analysis under the conditions of setting parameters, 25.5 ℃ and 1 300 mm/min are the ideal parameters and when the temperature is in the range of plus or minus 0.5 ℃, the film-remaining rate could be ensured with blank density up to standard.