Annual streamflow of Buha River and Shaliu River were studied in this paper. No significant changes were found during the past 50 years, which indicated that the decline of the water level of Lake Qinghai was not affected by the streamflow of the two rivers in Lake Qinghai basin. The monthly mean streamflow of Buha River had declined trend in January, February and March, and the monthly mean streamflow of Shaliu River also had declined trend in January, February, April and May. The yearly streamflow of Buha River was larger than Shaliu River, but the streamflow of Shaliu River was larger than Buha River within the range of from 55%-91%. The monthly steamflow of Buha River and Shaliu River were of great difference. High flow period of Buha River were found in the 1960s, normal flow period in the 1970s and 1980s, while low flow period in the 1990s. Compared with Buha River, the streamflow of Shaliu River was steady.