The series of 2-roller crusher can be applied in industrial sectors such as ore crushing ,chemical industry, cement, refractory, abrasive and construction industries to break ores and stones of high and medium rigidities, and particularly applied in the building material industry to produce pisolitr and pea gravel, which is with better effect than ordinary crushers. This series crusher has good characteristics like reliable working, simple maintenance, low operating cost and adjustable marking granularity.