DU Fu had a relatively relaxed mind on humble cottages period in Chengdu, which caused to his many poetries having chanted countryside life and scene of natural world. At first glance, these poetries had been lighted writing and leniently treating, but DU Fu' s original mind was not quiet also not relaxed, under the lighted writing there had a deeply distressment meaning. Lighted writing and deeply distressment is contradictory to each other, and also they commonly formed, which enhanced DU Fu' s humble cottage poetry to a inherent confliction and tenseness.