1 Introduction  
2 Galaxy Catalog  
2.1 Galaxy Catalog Overview  
2.2 The Completeness of HUDF Catalog for the Analysis of CSS-OS and LSST  
2.3 Galaxy Sample Selection  
2.4 Mock Galaxy Spectrum  
2.5 The Selected Galaxy Attributes  
3 The Method of Image Simulation  
4 Simulation Result and Data Analyzing  
5 Summary