This paper discusses the influence of grounded fault resistor and line's distributed capacitance on the injected signal for location of single phase grounded fault in a distribution network. It develops a model of line for location as well. Based on the discussions， functions of location reliability with grounded fault resistor and line's distributed capacitance are derived. Based on the functions， following conclusions are obtained: the reliability drops with increasing of resistor value， injected signal's frequency and complexity of line's structure. A location method of combining DC method with AC method is presented. The definition on product of grounded fault resistor value with line length is made as a basis of choosing DC method or AC method for location. The location method proposed is validated by field experiments.