On May 18, as the feed was cut off, the turnaround of 1000KTA ethylene cracker was initiated, which marks the satisfied completion of the first cycle length of ethylene plant. During the past 1440 operating days, this plant had produced 4.2661 million tons of ethylene and 2.1 million tons of propylene with total profit of RMB 11.663 billion. ZRCC reached several new records for large ethylene plants of Sinopec, namely initial cycle length, production and total profit, meanwhile, a number of technical and economic indicators rank 1st quartile group.