The present application relates to the technical field of memories. Disclosed are a three-dimensional
dynamic random access memory and a manufacturing method therefor, which are used for increasing the storage density of dynamic
random access memories, and increasing the contact area between a source region of a
transistor and a contact structure or a
capacitor as well as between a drain region of a
transistor and a contact structure or a
capacitor, thereby reducing
contact resistance, and ameliorating electric leakage. The three-dimensional
dynamic random access memory comprises a plurality of memory cells distributed in a three-dimensional array and a
dielectric structure used for isolating different memory cells; each
memory cell comprises a
transistor and a
capacitor, the transistor comprising a gate, a
gate dielectric layer, a channel region, a source region and a drain region; the length direction of each channel region is parallel to a second direction, and two sidewalls of each channel region in the length direction are recessed inward with respect to sidewalls of a corresponding first
dielectric portion, so as to form recesses; the source regions and the drain regions cover inner walls of the recesses. The manufacturing method for a three-dimensional
dynamic random access memory is used for manufacturing the described three-dimensional dynamic
random access memory.