There are many factors which can influence the efficiency of scroll compressor, and one of them is the internal leakage problem. However, the traditional function to avoid internal refrigerant leakage in scroll pump is designing a sealing mechanism to dynamic seal the scroll clearance caused by the unbalance inner forces and moments in scroll compressor. As we know that the leakage path has been determined while the scroll line length has been designed. Axial leakage would be larger than flank leakage because of its longer leakage path. This paper has tried to discuss a sealing mechanism which is called leaf spring type axial compliant mechanism, and it could improve the volumetric efficiency and increase the cooling capacity. The compliance mechanism is used on controlling the floating tolerance of fixed scroll between frame and separate plate and keeping the minimum axial leakage. Another reason is the incongruity back pressure of fixed scroll in the axial direction that could increase the pushing forces on the fixed scroll to orbiting scroll. That causes more friction loss which could induce the decreasing of the compressor efficiency. For eliminate the unnecessary loss, this paper take case study of designing an axial compliance leaf spring structure to limit the floating distance of fixed scroll and keep the tip clearance under the optimum state. From finite element analysis and prototype test, this new module of sealing function could bring low noise and height cooling performance.