Precise inking of every channel is the presupposition of inkjet printers' linearization. The principle and feature of LSM piece wise curve-fitting technology was analyzed. Pictures' different tones were treated with LSM piece wise Printing feedback controlling curve was fitted with LSM piece wise curve-fitting technology and common LSM curve-fitting technology. Sample sheets printed by the two control technologies were evaluated and compared. The results showed that LSM Piece Wise method is more suitable for the inkjet printers' feedback control.