The synchronous conttol system of Theodolite camera is analysed

then several feasiblecontrol schemes are raised and discussed.In the end

the schemes are laid emphasis on oneof them

which used DC motor as execution unit and SCM 8098 as CPU

In the scheme

current detecting unit is added to the original control system. At the time of starting themotor

the current detecting feedback is switched on until the rotational speed of the motorclose to the given speed

then the current feedback is switched off

speed-positon doubleloop control system is put into operation. According to the result of the experiment

wecould say the scheme is effective

and the performance of the synchronous control systemwas improved.