The invention provides an I frame resolution method and an I frame resolver in a streaming media system. The method comprises the following steps of: (a) acquiring a video transmission packet from an input transmission stream; (b) buffering the video transmission packet; (c) identifying a packed basic stream and a basic stream to find an original code of an I frame / an original code of an I codefilm; (c) judging whether the original code of the I frame is searched; (e)judging whether the original code of the I code film is searched; and (f) judging whether the original code of the new I code film is searched. The method further comprises the steps of: when the residual data length for searching is judged to be insufficient in the step (d) and meets the comparison condition of the original code of the I frame, storing a current searching address; and returning to the step (a).