The invention provides a technology for inducing the redifferentiation of calluses of Taxus wallichiana var. mairei to improve or maintain the genetic stability of the cellular metabolism of the Taxus wallichiana var. mairei and improve the content of paclitaxel as a secondary metabolite of the Taxus wallichiana var. mairei. The technology comprises four steps of explant preprocessing, induced culture of calluses, calluses subculture and calluses redifferentiation induction. In the step of induced culture of calluses, subculture is performed four times with 20-35 days for each culture, the calluses with good color and right texture are transferred to an improved MS (Murashige & Skoog) culture medium in which 0.05-0.20mg/L6 of BA, 0.2-2.0mg/L of NAA, 0.1mg/L of KT and 0.5mg/L of CH are added for redifferentiation induction culture, after 45-75 days of the induction culture, tiny sprouts grow from the calluses of the Taxus wallichiana var. mairei, the calluses are harvested at the time, after samples are subjected to drying, weighing and a series of preprocessing, HPLC (High Performance Liquid Chromatography) is adopted to measure the content of the paclitaxel, and a result shows that the content of the paclitaxel is one time higher than that of the calluses which are not subjected to differentiation. In the improved MS culture medium, ammoniacal nitrogen is 2000-2600 mg/L and the nitrate nitrogen is 800-1000mg/L.