The snow melt runoff in different scale observation sites of slope, mini watershed and small watershed were monitored during past four years in the typical black soil area of Northeast China. The results showed that the beginning and duration of snow melt runoff was determined by the daily maximum temperature and the amount of snowfall in the winter. The runoff coefficient of snowfall was much larger than that of rainfall, and the annual amount of snow melt runoff was even more than that of rainfall in some years. The runoff coefficient in slope scale was larger than that in watersheds. The amount of snow melt runoff in small watershed could figure out the amount of snow melt into river. The runoff coefficient of snow had a large fluctuation, from 3 percent to 83.6 percent during the past four years, and annual mean runoff of snow melt was 59.3 percent of runoff of precipitation. Hence, the snow melt runoff can not be neglected in runoff monitoring.