The adjusting operation for Yucheng wastewater treatment plant (WWTP) is introduced. In this paper, the problems during the course of testing operation from the starting condition of bacterium tamed, the installation of equipment and the hydraulic flow performance etc. are analyzed and discussed. Based on abovementioned, it is pointed out that there is some adjusting operational experience suit for middle-small town WWTP facing with bigger fluctuation of influent quantity and higher impact load.