Abstarct: Due to excessive consumption of energy along with the lack of a suitable model for the proper use of energy sources on the one hand, low efficiency at power plants, emissions of pollutants, high costs for primary energy and passive defense on the other hand, Today, many countries are paying attention to the use of new methods to improve conditions and performance, cost savings and energy consumption. Consequently, combined cooling, heating and power (CCHP) systems have played a significant role in the studies of researchers, statesmen and investors, and have become operational. The advantages of these systems can be high flexibility for use in small, medium and large scales in industries and other sectors. In the present study, the technical and economic aspects of a CCHP system, including an internal gas engine, a single water-ammonia absorbing chiller and a boiler for the maintenance of an industrial cold storage were investigated. Also, a cold storage with a capacity of 5000 tons to store orange product in the city of Sari, with the assumption of the arrival of the product from 20th of October to 29th of November for 40 days and storage until March 30th is considered. The meteorological data used in this study was for the year 2017-18 during the maintenance period and the critical days each month, as well as the hourly performance of the absorption system at the most critical day of the study. By Using EES software, Firstly it simulates the cold store and Heat loads of cold storage at different times of The most critical day of the product storage period is calculated and displayed that In the most critical day, 450.91 kW cooling is needed to keep the product in good condition. In the next step, the modeling and evaluation of the performance of the absorption system during the maintenance period and at different times were the most critical day of the day of November 29th has been done that the hourly results show the optimal Ideal temperature variation range for the generator and COP in the range of (345K-390.3K) and (0.5153-0.6992), respectively. Also, baxsed on the results of the absorption system performance during the most critical day of the period, the evaporator load at the most critical hour of 29 November was 459.9kW, which would eliminate the need for the cold store. The results of system calculations during the period and at the most critical times of each month of the maintenance period for the temperature of the generator and the COP of the system were respectively range of (347.8K-390.3K) and (0.5153-0.689) is showing. In the following, other parameters of the CCHP system such as system efficiency, percentage of reduction of operating costs, reduction in fuel consumption and payback period, are investigated and the effect of variable parameters such as engine load and Prime mover capacity on them is observed and analyzed. It can be seen that during the whole maintenance period and considering the assumptions of the problem, the overall efficiency of the system is 89.59, the percentage reduction in operating costs of 81.34, the percentage reduction in fuel consumption 78.85, and the payback period on investment with consideration of interest rates and without consideration Getting it is 4.075 and 2.701 year, respectively.