In this paper, a memristor analog model based on a light dependent resistor (LDR) is presented. This model can be simplified into two parts: a control circuit and a variable resistor. It can be used to easily verify theoretical presumptions about the properties of memristors. This LDR based memristor model can also be used in both simulations and experiments for future research into memristor applications. Mathematical models that describe the behaviors are derived. Multisim simulations and experimental results are given as well.