Abstract: Based on the general equation of curved profile worms, the reverse solution principle of parameters of these worms is introduced. Emphases are made on measuring worm profile and analyzing measured data in the case of no specifications of worms. Meanwhile, example of reverse solution of ZC worm is presented. Practice indicates that the principle and method are effective.

Key words: ZC worm, worm measurement, reverse engineering, reverse solution, curved-profile worm, ZK worm