With the present of the smart grid concept, a fast and robust load flow is needed for distribution planning, optimization of power system etc in future. This paper presents a review and summary of research developments in the field of distribution generation modeling and distribution network power flow in recent years. The solution techniques of distribution network power flow problem in phase frame are classified under two major reference groups, while the sequence frame approach present alone. Attention is given to the techniques to deal with balanced/unbalanced, radical/weakly meshed/mesh configuration, with or without distribution generation in the end of this paper. The purpose of this paper is to offer an ideal for follow-up study to consummate distribution load flow and a help for choosing the suitable load flow in distribution system research.