In view of the systemic study of the whole basin, the authors established Silurian criterion sec tions in different areas in Tarim Basin. For the Silurian rudimental strata, 5 sequences(SQ1-SQ5) can be distinguished and different sequences are classified in different areas owing to their eroded extent. Except for the sequence boundary 1 (SB1), the other Silurian sequence boundaries are generally hard to trace in the whole basin. According to the seismic phase responses for the Silurian sequences, it is hard to subdivide the system tract in the inner of them. The sequences SQ1 and SQ3 are ones of ascending semi-cy- cles of the base-levels and the SQ2 and SQ4 represent ones of descending semi-cycles. The SQ5 is an integrated eustatic cycles sequence. The basin floor fans in LST, the coastal sandbodies in TST, and the progradational compound sandbodies in HST are the most favorable reservoir-seal rock assemblages for marine clastic reservoirs in Tarim Basin. It is suggested that The important prospecting sequences are SQ2 and SQ4 and the main exploration targets are the shoreline sandbodies.