Abstract: Horizontal well acidiication is one of the effective methods. Recently based on the necessity for uneven acidiication and side effects of horizontal well, and combining the various completion well methods, the research methods of mogeneous acidiication technology of horizontal well were determined. By theory analysis and laboratory study, the homogeneous acidiication distributing pipe string and corresponding acidiication tools were developed; controlled acidiication technology had been come into being. The success application in Jidong Oilield and LIAOHE Oilield, string and corresponding acidiication tools get desired effect and higher success rate, and provide broad prospects of horizontal well acidiication in future.