You can't make eevee evolve into espeon by leveling it up. You have to give it a certain stone. I think it might be a moonstone, but maybe that makes eevee evolve into umbreon.
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if i get eevee in level 20 what level eevee need to evolve into espeon
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
When it's love for you is at the maximum level, it will evolve into espeon during the day.
Up your friendship with Eevee, then level it up during the day.
Evolve it from eevee