Abstract: This paper summarizes the techniques and experience of highly deviated wells in Sichuan Basin,Southwest China in the sixties,and gives the praspeet of future development.The more than 20 wells drilled in 1965-1966 include horizontal well,highly deviated multi-hole wells,mufti-hole coring wells with large horizontal displacement,and continuous coring deviated wells.Special instruments,tools and equipment were developed to meet the needs of drilling,coring,logging,cementing and completion of these highly deviated wells.Spevial technology was also developed,and some major parameters crf perfarrnance reached advanced world level at that time.