The carbonate content of bulk samples was analyzed for the sediment cores of MD06-3050 taken from Benham Rise, western Philippine Sea. The fluctuations in carbonate content for the past 150 ka show a general pattern of the “Atlantic type” of carbonate cycle, i.e. lower in glacials and higher in interglacials. By comparison of above proxies, it is inferred that there may be multiple factors controlling the variation in carbonate content, but dissolution is certainly the most important. This dissolution pattern maybe related to the Corg/CaCO₃ rain ratio and the ventilation of deep water.