Provided are a thin film transistor and a manufacturing method therefor, an array substrate and a manufacturing method therefor, and a display apparatus. The thin film transistor is positioned on a base substrate, and the thin film transistor comprises: an active layer comprising a first surface and a second surface arranged opposite to one another, the second surface being closer to the base substrate than the first surface; and a source and drain electrode layer comprising a source electrode and a drain electrode separated from one another, the source electrode and the drain electrode respectively being connected to the active layer, the first surface and the second surface both being non-planarised surfaces, and each non-planarised surface comprising a plurality of recesses and a plurality of protrusions arranged alternately. The active layer with non-planarised surfaces has a greater heat dissipation area, and can effectively avoid the reduction of electron mobility and weakening of driving force caused by thermally induced change, avoid the positive shift of a photo-induced self-heating stress curve, and ensure the performance stability of the thin film transistor.
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