In urban ecological planning, there are plenty of the contradictory problems about plan goal and antithetic goals. It is an important and fussy work to solve these problems. This paper tries to untie these problems by using transforming bridge strategy of Extenics. Start with transforming part for separation and connection, analyze antithetic problem, establish problem model, analyze and transform goal etc. tackle antithetic contradiction, realize the sustainable development of ecology, economy and society.