Abstract:A high voltage static electricity system used for preparing microcapsule is designed. The contrast experimental researches on the encystation voltage and the jump-spark voltage of flat pinhead and inclined pinhead are carried out. Parameters such as voltage, push speed of solution, distance between pinhead and surface of CaCl2 solution which are of influence on the diameter size and the uniformity of microencapsules are analyzed. The conclusions are that the flat pinhead is better than inclined pinhead, and the optimized parameters combination is 5kV voltage, 50mm/h push speed of solution and 20mm distance from solution surface.