Abstract: Over a long period of time, both domestic and foreign hydrologists have studied the curve types of flood fre-quency. However, it can not be theoretically determined that what kind ol frequency distribution the peak dis-charge belongs to. In flood frequency analysis, all the estimated results, including the various statistical parame-ters, designed peak discharge of the various flood frequency and the selected cur tained based on the flood data collected during a short period. Thus,, the considerable enol ‘i nbvdnf testochatstic, calculated, and systematic erf fs exls o ccuring in the mid-smallstreans on the aoroden sloye f lefrequency are selected for fitting analysis of floods occurring in the mid-small strean Tianshan Mountains. The fitted results are ideal at 9 hydrometric stations among 11 in total.

Key words: flood, curve type of frequency distribution, Xinjiang, North slope of Tianshan