Real-time and rapid acquisition of mutual inductance and load values can help improve the precise control of wireless power transfer systems. Therefore, an estimation method of mutual inductance and load without communication between primary and secondary is proposed in the paper. Firstly, the relationships between mutual inductance and load and primary electrical parameters are established, and then a method of estimating mutual inductance and load solely based on primary electrical information is designed. Finally, simulation and experiment are carried out to verify the error of estimation can be converged.