The invention discloses an index information storing and searching method and storing system based on sparse analysis. The storing method comprises the step 101) of carrying out quick sparse analysis on achieved index contents and the step 102) of storing the index information which the quick sparse analysis is carried out on into a set storing structure. The set storing structure is used for storing index parameters of a plurality of subfiles with different multiple-time speeds, and all frame describing information related to same-time speed display is continuously stored. In addition, the index information obtained from the sparse analysis is the index parameters in the storing structure. The step 101) further comprises the step 101-1) of firstly acquiring index header information according to the structure standard of the Index contents and the step (101-2) of sampling and extracting frame index information according to the ratio of file display multiple-time speeds of the subfiles and analyzing the frame index information of the extracted part. Furthermore, the index header information comprises the total length of the index contents, describing information of the index contents, information of all subfiles and the frame index information.