a multi - modulation frequency laser range finder and a method for the same make use of a crystal oscillator to send out a modulation signal and a sampling signal . after the modulation signal is coupled with a light signal emitted by a laser diode , a laser light beam is generated and emitted to a target . the laser light signal is reflected by the target and received by a receiver to be converted to a reception signal , which is processed according to the frequency of the sampling signal . the processed result is finally sent to a data processor to calculate out the distance to the target . as compared to the prior art , less number of components are used , the precision is enhanced , and the circuit is much simplified , hence reducing the errors and the cost .