Given an ever increasing power system reform, a clean, intelligent and competitive incremental distribution network emerges as is now required. The incremental distribution network not only has flexible structure, but also encourages a variety of intermittent distributed generation and new loads to access the distribution network side. Traditional distribution network planning technology has found it difficult to adapt to the incremental distribution network with source-network-load uncertainties. Given this, the incremental distribution network planning research is reviewed with particular consideration of source-network-load uncertainties. The development status of new source-network-load in an incremental distribution network, the uncertainty analysis methods suitable for incremental distribution network planning stage and common planning research methods are summarized and analyzed. Finally, the summary of and prospect for incremental distribution network planning considering source-network-load uncertainties are given. This work is supported by the Science and Technology Project of State Grid Corporation of China (No. 5216A220000F).