The present invention relates to a novel crystalline ethyl acetate solvate form of cabazitaxel or 4α-acetoxy-2α-benzoyloxy-5β,20-epoxy-1β-hydroxy-7β,10β-dimethoxy-9-oxo-11-taxen-13α-yl(2R,3S)-3-tert-butoxycarbonylamino-2-hydroxy-3-phenylpropionate and process for preparing the same.本發明係關於卡巴利他索(cabazitaxel)或(2R,3S)-3-第三丁氧基羰基胺基-2-羥基-3-苯基丙酸4α-乙醯氧基-2α-苯甲醯氧基-5β,20-環氧基-1β-羥基-7β,10β-二甲氧基-9-側氧基-11-紫杉烯-13α-基酯之新穎乙酸乙酯溶劑化物結晶型及其製備方法。