In this paper, we propose a NAND flash write throttling technique in memory reclamation. This technique controls the write traffic on NAND flash memory considering the expected NAND flash memory lifetime. During the memory reclamation in operating systems, many write requests to the storage are generated-dirty page writeback and swap out. Our technique monitors the write traffic and controls the threshold values for dirty page writeback, swap or process kill. Experiments show that the proposed algorithm reduces the write traffic by 43% without increasing the read traffic significantly.