The characteristics and main design parameters of largediameter hard rock TBM used in No. 4 Bid Section of the Songhua River Water Conveyance Project are analyzed. The rock strata of the project are complicate; there are many fracture zones and limestone and quartz locally; and it requires highperformance of TBM cutterhead and cutting tools. As a result, the TBM cutterhead is manufactured by 270 mm thickness plate; the nonlinear distance among cutting tools is 82-90 mm; effective primary supporting system and material transportation platform are designed; and advance geology prediction system is adopted. The construction practice shows that the TBM cutterhead designed is reliable and highefficient; the supporting efficiency of TBM in bad geological conditions is high; and the advance geology prediction results are reliable.