Oyster farming is big in Southern and West Coast in Korea. It is the most dominant source of income of the local residents however, in the process of shipping oysters, people tend to sold the flesh only after removing oyster shells. Therefore, a lot of shells waste are being made near oyster farms and shucking factories. Some oyster shells are recycled as seeding collection and fertilizer. Nevertheless, in terms of cost-effective matter, a large amount of shells are piled up in an untreated condition and when shells are overloaded, bringing shells could be even blocked. It is increasingly happening chances that shells could be left behind near shucking factories unattended. This is detrimental to society and residents' living environment by causing bad smell along with spoiling coast landscapes. In consequence, this study examines producing PCC(Precipitated Calcium Carbonate) through Pilot plant along with methods for pre- treatment for oyster shells, quicklime manufacture and slaked lime stone making method in order to recycle oyster shells as fertilizer, cement raw or paper fillers. For this PCC production experiment, oyster shells were crashed smaller than 2cm diameter using Crusher to remove salinity and moist on the surface. Electric Oven was used to produce (Ca(OH)2) and the experiments for carbonation of it were used to transform into CaCO3. This study result shows that CaO content from oyster shell was 95.5wt% and CaO content from limestone was 99.1%. This educates that even though oyster shell CaO rate was lower than limestone's, still it contents more than 95% of CaO. Also, 80.4% of slaked lime made from oyster shell has changed to Ca(OH)2 in the case of using limestone, 52% has changed to Ca(OH)2. Oyster shell's calcium oxide content and whiteness is higher than limestone. So It was investigated as competitive as possible. But, The quality of PCC for paper utilizing oyster shell was investigated at a low level compared to current commercial products. Therefore, Applying the PCC of oyster shell was investigated as difficult.