A glass with a reinforced layer is provided, including a glass body and the reinforced layer formed in a surface of the glass body. The compressive stress of the reinforced layer trends to decrease non-linearly from the surface of the glass body to the interior of the glass body. The compressive stress curve of the reinforced layer has an inflection point. The gradient of a first curve section in front of the inflection point is greater than the gradient of a second curve section behind the inflection point. The overall refractive index of the reinforced layer trends to decrease non-linearly from the surface of the glass body to the interior of the glass body. The refractive index curve of the reinforced layer has at least two inflection points. Furthermore, a method for preparing the glass with a reinforced layer is provided.