Aiming at the incremental distribution network market at park level under the background of the new round of electricity reform, the problems and demands of load forecasting in power network planning are analyzed, and the description of load forecasting conclusions for incremental distribution network planning is improved, and a load forecasting model considering uncertainties such as distributed energy and occupancy rate is further proposed.Different confidence intervals is set according to the forecasting demand, and the load forecasting of incremental distribution parks under different development conditions is revised. Practical examples show that the method can provide a quantitative idea for precise planning of park incremental distribution network considering uncertainties.