Abstract: The area in the northeast Sichuan is superior in the accumulation setting of natural gas,abundant in source rock, plentiful in trap type and good between pool formation matching. Through the drilling and construction at the earlier stage,the ordinary drill bit-bushing program and the bore frame design are hard to meet the requirements of the complex geological setting of extremely deep well.On the basis of analysis on application characteristics of deep well bushing program and ordinary well bore frame,and according to the present status of drill bit and bushing performance,an optimized draft of complex well bore frame in the marine facies of the northeast Sichuan is presented on combination with the field production,which is of practical significance for the increase of the drilling performance.