Drop formation characteristic of liquidliquid circulating fluidized bed (LLCFB) were experimentally studied by means of image gathering and processing. Three typical liquid-liquid atomization forms related to drop formation were defined. The relativity was investigated between liquidliquid atomization forms and jet length fluctuation or drop size distribution, and the change rules of liquidliquid atomization forms, jet breakup intensity, jet length fluctuation and drop size distribution were obtained with the relative Reynolds number (Rer) between the two phases. The results showed that the course of drops formation rested seriously with Rer. Along with increasing Rer, jet break up intensity was strengthened continually and liquid-liquid atomization formed by trickling to the laminar jet transformation, developed finally for turbulent motion jet. Jet length fluctuation was characterized by random and no periodic. The overall change tread of standard derivation was consistent with average jet length each other with Rer, and their maximum happened at 1.3×104. Furthermore, spread parameter of drop size distribution increased to the stage of turbulent motion jet atomization and the uniformity appeared at 2.5×104, but the average diameter of drops always decreased with increasing Rer and its maximum at the stage of turbulent motion jet atomization.