An external memory is necessary to store data and status files for new automatic weather station. This fixed format files are filled with time and the character “” when the time has not arrived yet. This paper introduces a solution that uses the asynchronous copy method to solve the problem that the station can not collect meteorological data normally when the SD card files are being generated. And the generated files meet the new automatic station file format. The experiment results proved that the collector works well and the collected times are not affected and the files sampling data is 100 percent right compared with the software data.