Abstract: Provided is a compatibility promotion method, storage medium, and system for HDMI. The method comprises steps of reading EDID to be analyzed of a display device; defining a situation 1 as the existence of non-standard timing of EDID to be analyzed; defining a situation 2 as the bandwidth of the resolution supported by the display is greater than a maximum bandwidth of a HDMI intermediate device; if the EDID to be analyzed meets the situation 1, after modifying the timing of the EDID to be analyzed into an HDMI standard timing, and then forwarding the modified EDID same to an input source device; if the EDID to be analyzed meets the situation 2, modifying a color depth sampling format and a color format of a resolution greater than a maximum bandwidth of the HDMI intermediate device in the EDID to be analyzed to be within a supported bandwidth range.