The invention provides a memory management method, a memory management system and a server, belonging to the technical field of the server. The memory management method comprises the following steps: presetting at least two memory pools which comprise frequently-used memory chain tables and big memory chain tables according to the size of the memory; receiving the user's request for applying for the memory and positioning the memory pool according to the size of the memory applied by the user; controlling and allotting the memory of the frequently-used memory chain table reading the memory pool to the user applying for the memory when there is available memory in the frequently-used memory chain table of the positioned memory pool; controlling and allotting the memory of the big memory chain table reading the memory pool to the user applying for the memory when there is no available memory in the frequently-used memory chain table of the positioned memory pool. The invention has high memory allotting efficiency and high memory allotting concurrency and realizes that the plurality of memory pools correspond to a plurality of parallel threads.