Y3 complex fault block reservoir is with characteristics of complicated tectonic system, many small fault-blocks, faults, many oil bearing formations and different oil reservoir types; it is difficult to improve economic benefit by traditional drilling techniques. Based on the statistical analysis on real drilling data of Y3 block, and according to the casing program, well trajectory and the bit type, the optimized drilling plan suitable to this block was put forward. The application shows that the coincidence rate between drilling trajectory and design plan is 90%, which further indicates the technical feasibility of optimized drilling plan, and provides the important technical support to subsequent well in the cross fault-block development and optimized & fast drilling construction.