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The maximum allowable angle between the incident light and the normal line of the parabolic in the trough solar collector is discussed by using the method of geometrical optics. And the calculating formula for the angle is also given. The principle of shading method sun tracking sensing module is discussed. Then a formula is derived to calculate the height of the shading plate. The method of judging the four different relative positions of the sun and parabolic trough solar collector by comparing the ADC value of east and west between ADC_th is discussed.A sun tracking hardware module sample is designed. According to the test result, the module can drive the parabolic trough solar collector system to track the sun correctly .