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As a large number of grid-following converters (GFLs) have joined the power system, transient characteristic of the power system is profoundly being changed. Aimed at the case of coupling system integrated by GFL and synchronous generator (SG), it is necessary to analyze synchronization stability of coupling system in the large-disturbance case. To address that, this paper investigates the coupling system between GFL and SG firstly. Then, the equivalent model of coupling system is derived. Next, transient stability analysis of GFL based on the equivalent model is conducted to detect the transient instability mechanism. Two instability modes of GFL are defined. Finally, time-domain simulation results verify the correctness of theoretical analysis.