With the high increasing penetration of renewable energy, high participation levels of flexible load and high efficiency and reliable operation of coordination management, it is difficult to meet the investment development requirements of distribution network with multi-agent access by traditional way. In order to adapt to the multi-agent access and promote clean energy consumption and provide rich samples for precise investment planning of active distribution network, a model of planning sample automation simulation is proposed based on multi-agent and technical path. According to the built multi-agent models of DG, ESS and flexible loads, an automation coordinated strategy by grid agent guidance is designed. At the same time, in order to improve the utilization efficiency of multi-agent in active distribution network, the model considers load growth and the change of technology path to analyze the economic operation ability under different schemes. The results of the model are verified by following the development of technology path to realize the simulation of long-time scale of active distribution network. The characteristic quantity such as the output of distributed generation and the fluctuation of load generated by automatic simulation method can be substituted as the data sample of the subsequent investment planning of active distribution network. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 52130417002R).