A method and a circuit for improving charging of a liquid crystal panel, the circuit comprises at least one temperature compensated overdrive voltage regulating unit, each of the driving voltage regulating units includes a temperature sensor for detecting a temperature of a liquid crystal panel and outputting a digital value representing the temperature; a reference voltage generator for obtaining a corresponding reference voltage according to the digital value of the temperature; and a voltage regulator for regulating a level of a high output voltage of a gate of the TFT-LCD panel according to the reference voltage. The present disclosure can reduce the cost of a liquid crystal panel and enhance its performance.