The main goal of this research is to create a simple and practical thermodynamic model to study and predict the wax appearance temperature, using cubic plus chain equation of state (CPC). In this work, the multi-solid and solid solution models together with the cubic plus chain equation of state have been used to predict the wax appearance temperature of three-component and two-component systems. In the solid solution model, the solid phase is considered as an ideal solution. In this research, the modeling results of calculating the wax appearance temperature for twelve hydrocarbon systems have been obtained and compared with the experimental results. Hydrocarbon systems consist of five ternary systems including C14-C15-C16, C18-C19-C20, C16-C17-C18, C14-C16-C18 and C11-C16-C18 systems and also, seven binary systems including C11-C18, C16-C18, C14-C16, C14-C15, C17-C19, C15-C19 and C16-C20 systems. According to the obtained results, the average absolute error in calculating the wax appearance temperature for ternary systems C14-C15-C16, C18-C19-C20, C16-C17-C18, C14-C16-C18 and C11-C16-C18 using multi-solid thermodynamic model were, 0.29, 1.30, 0.54, 0.91, and 1.62, respectively, and using solid solution thermodynamic model were, 0.59, 1.8, 1.06, 0.85 and 1.2, respectively. Also, the average absolute error for binary systems C15-C19, C17-C19, C11-C18, C16-C18, C14-C16, C14-C15 and C16-C20 using the multi-solid thermodynamic model were 2.5, 0.34, 02 0.1, 0.92, 0.68, 1.2, and 1.4, respectively and for solid solution thermodynamic model were, 2.55, 0.67, 1.26, 1.16, 0.91, 2.1, and 1.5, respectively. It was also observed that the results of wax appearance temperature calculations for systems containing C11 had more deviations compared to other systems. Comparing the results obtained in this work with the works of Aftab et al. [1], Shah Ahmadi et al. [2], Mansoorpour et al. [3] and Qanaei et al. [4] showed that the multi-solid model with CPC equation of state used in thi