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The solar power tower system is an attractive method for electrical power generation on a large-scale, and offers significant performance advantages over line-focus systems. The tracking control of heliostats is one of key technologies of power tower system. Firstly, this paper presents the formulae of tracking angle and incidence angle of heliostats based on position in mirror field by vector analysis, which can be made use of optical efficiency analysis such as cosine factor and shading and blocking factor. Then, the changing trend and speed of heliostats' tracking angle was analyzed, furthermore, which is convenient for customizing tracking strategy and designing mechanical structure of heliostats. Finally, statistical analysis of heliostat tracking angle error as a result of tracking controller' longitude and latitude setting error was done, which can be used of determining control region.
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