The invention relates to a key circuit unit positioning method based on an embedded parallel structure genetic algorithm, which belongs to the positioning technology field of key circuit units in integrated circuits. Specifically, the method includes: 1) network table analysis and initialization of related quantities; 2) constructing an initialization population oriented to the key circuit unit and initializing the current evolutionary algebraic variable j=1; 3) building a hall of fame library HG, and storing that b individual in each generation into the HG; 4) if i is greater than Nsm, go tostep 7), otherwise, going to step 5); 5) calculating the diversity div of the population; 6) calculating the key values of each circuit unit in the current HG circuit; 7) calculating the key values ofeach circuit unit in the LC; 8) arranging the key values obtained in the step 7 in descending order and outputting the corresponding circuit units. The invention is helpful for realizing the high reliable design of the circuit structure with less cost and shortening the design period of the circuit.