Due to the close relationship between the actual output of the inverter and the transmission between the components, there is often a low adaptation effect to the working conditions in the actual application process. Therefore, a research on the dynamic control method of a three-phase photovoltaic grid-connected inverter considering the standard characteristics and mapping characteristics is proposed. On the basis of considering the standard characteristics, a three-phase photovoltaic grid-connected inverter model is constructed, and the analysis of the characteristics of the DC/AC discrete iterative mapping of the three-phase photovoltaic grid-connected inverter is analyzed. According to the relationship between the discrete iterative mapping characteristics and the standard characteristics, the dynamic control of the inverter is realized. In the test results, the inverter output voltage presents the most stable development trend when the grid-connected current suddenly increases from zero current to rated current. The reactive power output is always stable within 1.30 KW under different sudden drop current intensities.