Abstract: By introducing subcircuit module and taking suitable values for the parameters as well as the characteristics of the nonlinear resistance, a four-dimensional generalized Hartley model whose fast subsystem has multiple balances is established. Based on the multiple balances as well as stabilities of the fast subsystem, bifurcation sets are derived, which divide the parameter space into different regions. In each region, nonlinear dynamical behaviors as well as the bifurcation patterns corresponding to different critical conditions are obtained. Two typical cases with different bifurcations are investigated, in which two different bursting oscillations with multiple balances of the fast subsystem involved are presented. Combining with the bifurcation analysis of the fast subsystem, the mechanism of the alternation between quiescent state and the spiking state is explored, which reveals that multiple balances of the fast subsystem not only may cause multiple quiescent states and spiking states to involve a periodic burster simultaneously, but also may lead to the multiplicity of patterns of bursting oscillations.