The tour gauging is one of the current means of collecting hydrologic data, which is a sign that hydrology changes from traditional to modern. It is worthy to study whether making technique scheme of tour gauging has an influence on the parameters of runoff yield and flow concentration in small catchment, and how big the influence is. A study was made on the influence on the parameters of runoff yield and flow concentration at 3 small stream stations in Zhuzhou of Hunan Province by using the front and back parallel contrast analysis of tour gauging of hydrologic data and the random creating technique. The result is representative.