Computation operator in memory and operation method thereof

A computation operator in memory, comprising:

• a word line calculator, calculating a number of enabled word lines of a memory;
• a decision-maker, coupled to the word line calculator, and generating a plurality of reference signals according to at least one of the number of enabled word lines and a used size of the memory, wherein the decision-maker sets the reference signals according to a square root of the number of enabled word lines of the memory, or according to a square root of the used size of the memory, or according to a square root of the number of enabled word lines and the used size of the memory, and the reference signals are configured to set a distribution range;
• and
• a sense amplifier, coupled to the memory and the decision-maker, receiving a readout signal of the memory, and obtaining a computation result according to the reference signals.