It's so important to instill a love for reading in your child at a young age. Learning to love reading will help them throughout their life.
Make sure you have children's books in your home, whether they are library books or some of your own. Reading corners are fun for preschoolers. You can make one with just a basket of books and a bean bag chair. Encourage them to "read" in their reading corner.
Also make sure you are reading to your preschooler. This is so important. It will not only help enlarge their vocabulary, improve their grammer and help them learn about new people, places and things, but it will teach them that reading is fun and important.
If you have a child that doesn't enjoy reading, try picking out different books until you find some that appeal to them. Make reading daily part of your routine, maybe even reading in the same place at the same time each day so your child knows it's coming and looks forward to it.