There is provided a pixel circuit comprising a driving transistor (DTFT), a signal loading module, a light emitting control module and a storage capacitor (Cs). The pixel circuit can effectively eliminate the non-uniformity due to the threshold voltage of the driving transistor (DTFT) itself and the afterimage phenomenon due to the threshold voltage drift when driving the OLED, avoid the display brightness non-uniformity due to different threshold voltages of the driving transistors (DTFT) between the OLEDs of different pixel units. There is further provided a driving method for the above pixel circuit and a TFT backboard comprising the above pixel circuit.