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The size-controllable monodisperse CdSe nanocrystals with different organic capping were prepared based on hot-injection method. The effective separation of nucleation and growth was achieved by rapidly mixing two highly reactive precursors. As a contrast, we prepared CdSe/CdS NCs successfully based on selective ion layer adsorption and reaction (SILAR) technique, this inorganic capping could obtain higher photoluminescence quantum yield (PLQY) of 59.3% compared with organic capping of 40.8%. Furthermore, the CdSe-epoxy resin (EP) composites were prepared by adopting a flexible ex-situ method, and showed an excellent stability in ambient environment for one year. So the composites with both high PLQY of nanocrystals and excellent stability are very promising to device application.