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Feed horn is the significant equipment in the field of astronomical observation. The reliable change and accurate location of feed horn are crucial to receive the slight radio signal. Advanced astronomical missions with greatly enhanced resolution and physics missions of unprecedented accuracy will require laser distance gauges of substantially improved performance. In this paper, we designed an automatic control system, based on laser gauge and a fuzzy PID algorithm, which would be demonstrated with simulation diagram. The phasic laser gauge has operated in a closed-loop control, which improves precision and uses in exact telemeter generally, can suppress the effects of misalignments, and makes possible precise automatic alignment. The PID algorithm improved by changing the fuzzy section. In the end, we implemented the automatic control system on the Windows platform, which satisfies the accurate precision perfectly.