Paleoceanography research is always limited by the accuracy of age-depth relationships. For sediments below carbonate compensation depth (CCD) where other dating methods could hardly be available, relative paleointensity (RPI) provides a continuous geomagnetic field record with high resolution and it could be a practical way to develop an age model. Here we report the rock magnetic and paleomagnetic and relative paleointensity (RPI) records of five cores from the abyssal north pacific retrieved from SO264 and SO202 cruise with water depths greater than 4000m. The rock magnetic analysis showed that the magnetization is carried by two magnetic components, biogenic and detrital magnetite, and little variation in concentration and grain size suggesting that these RPI records are trustworthy. The paleointensity proxies are determined as slopes of NRM versus ARM from 20 to 80 mT for cores from SO264, from 20 to 40 mT for core SO202-33-4, and from 20 to 45 mT for core SO202-35-1. By applying paleomagnetic and relative paleointensity method, we dated these five cores. We documented all polarity reversals in these cores as age control and then correlate our RPI records with North Pacific records EPAPIS and NGC65/KR0310-PC1 to get an age model. Moreover, we defined volcaniclastic layers in each core, which may originate from concurrent eruptions and gravitational sediment redeposition and diagenesis layers from one of the studied cores, and analyzed the impact of biogenic, diagenesis, and volcaniclastic components on the RPI signal. We found long-term NRM loss and RPI amplitude decreasing in our long cores which is related to the variation of magnetic grain size that older sections of the RPI record with their finer (biogenic) magnetic particle sizes have consistently lower values. We consider this effect as the consequence of unstable magnetic behavior of magnetofossil oxidation.