Given a sequence of conformal metrics {gk=uk4n−2g0} on a smooth compact boundaryless Riemannian manifold (Mn,g0). Assume the volume of gk and Ln2 norm of scalar curvatures both are bounded. We prove that, after passing to a subsequence, uk weakly converges to the bubble tree limit (u,u1,1,…,ui,α,…,ul,αl),1≤i≤l<∞,1≤α≤αi<∞ in W2,p, for some p<n2, where u∈W2,p(M,g0) and ui,α∈W2,p(Rn,gRn). Moreover, after passing to a subsequence,the sequence of metric spaces (M,dk) defined by gk converges to a connected metric space (M∞,d∞) in the Gromov-Hausdorff topology sense and limk→∞Vol(M,gk)=Hn(M∞,d∞), where Hn is the n dimensional Hausdorff measure defined by d∞.