In the reconstruction process of historic district and old city, the method of “Organic renovation” has aroused interest in academic circles. The urban history public space is also one kind of important space form in the city, and in the process of plan and reconstruction, the concept of “Organic renovation” is suitable too. Take Lhasa Zongjiaolukang park as a case, this paper uses SD method to analysis and appraise the results of plan and reconstruction, and proposes the necessity of introducing the concept of “Organic renovation” to this area, then points out the questions that should be paid attention in the process.