Mono-dispersed stable kerosine droplets were prepared by a membrane emulsification method with microporous glass, and their microencapsulation was carried out by complex coacervation of gelatin and acacia. The effects of acetic acid dosage, cooling rate, addition time of core material in the encapsulation process, heating rate, and dosages of sodium hydroxide and formaldehyde in the hardening process on membrane thickness and the number of cores of generated microcapsules are investigated systematically. It is clear that the 30 to 20 degrees C range in the cooling process is an important temperature range for microencapsulation of kerosine droplets. Low dosage of acetic acid and low cooling rate reduce the number of core included in the capsule, and the membrane thickness and the number of cores in the capsule are almost independent of the operating conditions in the hardening process. Further, the results obtained in the encapsulation of the liquid drop are compared with the data of solid core microencapsulation.