This　article　describes　the　Parabolic　trough　solar　collector　design　of　single-axis　tracking　system　based　on　PLC,　Siemens　S7-300　as　a　controller,　using　a　complex　mathematical　model,　based　on　the　special　climate　of　Western　Region,　select　the　single-axis　design　process,　greatly　reduced　cost,　collectors　need　only　be　completed　that　automatically　tracks　the　sun　azimuth.　Feedback　device　selection　angle　sensor,　light　intensity　sensor　and　sun　sensor,　strain　two　conditions　that　cloudy　and　sunny,　which　greatly　improves　the　efficiency　of　the　collector,　the　better　to　achieve　real-time　tracking　grasp　the　situation.　©　(2014)　Trans　Tech　Publications,　Switzerland.