【正文】
area for more than XX years. what is more, chengdu as a name for this city has never been changed. in 316 bc libing built the dujiangyan irrigation the mid of the eastern han dynasty,the first public school in china was established by wen weng, a magistrate to the shu prefecture. chengdu has been a city that many rebels fighting for during the war time. about 7 separated sovereigns were established when the central government was too weak to control this encircled mountainous area. in 24ad, chengjia state was established in chengdu bu gongsun 221 ad,the shuhan kingdom was built by 907 ad,mangjian established the former shu state in 934ad, meng zhixiang established the later shu state in 994ad li shun established the da shun state in 1644ad,zhang xianzhong had the daxi peasant sovereignty established in chengdu. as we known,that chengdu has been the formal name for this city since its born,there are also many given nicknames, which tells us the history of chengdu city in a special way. the first city in chengdu built in qin dynasty was nicknamed as “the tortoise city “, for people followed a big tortoise crawling to build the wall. in the western han dynasty, with booming economy, chengdu was a highly famed for brocade. the silk and brocade was sold for the overseas. so,it was called“the city of brocade ”. as meng chang,the king of the shu state, ordered that the hibiscus planted along the city wall,which made the forty kilometers of the wall as beautiful as brocade, chengdu was known as “the city of hibiscus.” nowadays, chengdu as a metropolitan in the western