Considering the influencing factors of the layout of solar collectors such as the tilt angles,azimuth angles, spacing between collectors and the number of collector rows,a mathematical model of the collected energy of the solar collector with limited area on the horizontal plane is established. Two different optimized models including the cost-benefit model and the minimum annual auxiliary heating energy model are conducted in this paper. The results show that,the collected energy in a year could increase with the increase of the number of collector rows. And the collected solar radiation in a year increases firstly and then decreases with the increase of the collector tilt angles. Furthermore,the collected solar radiation in a year increases firstly and then decreases with the continuous increase of the azimuth angles from-90° to 90°. Taking Nanjing city of China as an example,based on the optimized objective of maximum benefit,the optimal layout of the solar collector array in the area of 200 m2 should include:the number of collector rows is 8,the tilt angle is 40° and the azimuth angle is 0°. Meanwhile,the optimal methods for the optimized objective of minimum annual auxiliary heating energy should include:the number of collector rows is 9,the tilt angle is 50°,and the azimuth angle is 0°.