A kind of MCU’s servo system based on touch screen is presented.The analog voltage value of the position of object followed is gained from a touch screen

it is conversed to the digital value by the A/D conversion chip

the digital value is inputted into the MCS system to deal

then the system results is outputted from the D/A conversion chip.The actions of motors and relay are controlled by the outputting result

so the object position is followed and the position axis of object is displayed on the LCD.The simulating result proves the method used in the system is validity.