The invention provides a method for manufacturing a nonvolatile memory, comprising: first, a waiting coding memory is provided, and a memory bank of the waiting coding memory has a first state after being programmed and a second state before being programmed; then, the number of the first states and the second states in program data to be coded can be calculated; when the number of the first states is more than that of the second states, the program data to be coded is reversely defined; and finally, after being reversely defined, the program data to be coded is written into the waiting coding memory.