Abstract: The LPC -2 type nozzle is new feed nozzle for processing heavy oil, especially for residuum of inferior quality. Its structure of outside is the same as the LPC-1 type feed nozzle, therefore it is compatible. But premixing chamber, mixing chamber and structure of inside in head of nozzle were improved. Comparing with the LPC-1 Type nozzle, under general same cases of the properties of raw oil and catalytic, and operating condition, rate of coke forming reduced, rate of light oil increased, distribution of products improved, and using up steam is few. Achieved better econonir results. The feed nozzle belongs in low pressure drop type, and has flexibl operation. This paper put the Technical demands of installing nozzle and operating too.