In this paper the structure of the self-triggering based laser rangefinder was analyzed, confirming the sources of the signal response delay. Under the condition of the normal pressure and temperature the standardized distances were measured with the laser rangefinder to get the results, which were later compared with the correct results got from the theoretical calculation, and the relation between the two was obtained, according to which the relational formula of the correction and compensation were deduced. Finally, with this system, some other measurements were proceeded, giving the results that were corrected after modifying the programmed algorithm adopting the correction, indicating that the corrected results error could be shrunk to millimeter level, which proved the validity of the correction. And the experiment results were stable.