Rapoport and Zink introduce the admissible locus and the weakly admissible locus inside the rigid analytic p-adic flag varieties. The admissible locus is related to the crystalline representations. And the weakly admissible locus is an approximation of the admissible locus obtained by removing a profinite set of closed Schubert varieties. In this talk, we will prove Fargues-Rapoport conjecture which gives a characterization when the admissible locus and the weakly admissible locus coincide. The main ingredient of the proof consists in a thorough study of modifications of G-bundles of Fargues-Fontaine curve. This is a joint work with Laurent Fargues and Xu Shen.