A threshold voltage supply circuit, threshold voltage supply method, fault analysis method, and display apparatus are provided. The threshold voltage supply circuit comprises a voltage supply unit (21) and a switch unit (22). The voltage supply unit (21) is used to provide respective M levels of a gate drive circuit with a threshold voltage within a predetermined voltage range when in a normal working state, or provide the gate drive circuit with a corresponding threshold voltage when in a fault analysis state, wherein M is an integer greater than 1. When the gate drive circuit is in the fault analysis state, the voltage supply unit (21) comprises an adjustable resistor connected between a threshold reference voltage output end and a threshold voltage input end of the gate drive circuit.
