It is possible to reach temperatures of 800 K by using parabolic trough solar collector, which has an important place in solar thermal applications. It is possible to produce steam and generate electricity with high temperature heat energy obtained with these collectors. Also, highly efficient absorption cooling systems can be operated. There are many such applications in the world. There are a few applications in our country, though. In this study, for a collector selected as an example, according to the first law of thermodynamics, equations were obtained by writing the energy balance in a steady state. The thermal analysis of the collector was made using the equations obtained. Main parameters that affect useful heat value and thermal efficiency of collector; The effect of radiation value, ambient temperature, wind speed, fluid flow and fluid inlet temperature were examined through a program. It has been found that high fluid flow rate and low fluid inlet temperature increase efficiency. In addition, it has been observed that higher thermal performance can be obtained in cases where the intensity of solar radiation is high, the ambient temperature is high and the wind speed is low.