The invention discloses the method and the equipment which under a kind of petroleum refinement process a line of tubular catalysis cracks, mainly uses in to solve the existing on line of -like lifting tube reactor multi- existences catalyst and the oil gas returns mixes seriously, after the next line of tubular reactor technology exists reactor demi-section question and so on catalytic reaction degree drop. The invention uses two section of -like under line of tubular reactor, comes from the first regenerator (5) under the temperature higher half regeneration catalyst and the raw oil (201) enter a line of tubular reactor (3) the crown, (301) under marches forward the line of catalysis cracking reaction along the first response section; After next line of tubular reactor (3) the middle catalyst entrance (304) introduces from the second regenerator (6) the temperature lower regeneration catalyst, with comes from the first response section (301) the under good catalyst and the oil gas mix, enters the secondary reaction section (302) under the continuation to march forward the line of catalysis cracking reaction. The invention mainly uses in the petroleum Heavy tar fraction catalyzed cracking processing.