Biological soil crusts were widely distributed in desert ecosystems, which could affect soil carbon release and regional carbon cycle through their own respiration. In this study, we took the algae and moss crusts as the research object, which were widely distributed in artificial vegetation area in the northeast of Qinghai-Tibet Plateau (Gonghe basin, Qinghai). We observed the diurnal and growth seasonal dynamics of soil carbon release rate in bare land and two types of biological soil crusts covered soil. The results showed that the diurnal and growth seasonal dynamic characteristics of soil carbon release rate with and without covered biological soil crusts were consistent with that of bare land, showing a "single peak" curve. The maximum daily carbon release rate of covered biological soil crusts appeared at about 13:00, and the daily peak value of the bare land and the removal of soil crusts appeared at about 15:00. The existence of biological soil crusts advanced the daily peak value of soil carbon release rate appear about 2 hours, and the daily peak value of carbon release rate of each observation types all appeared in August. In the relative dry year (2017), the soil carbon emission of covered algae and moss crusts was increased by 22.07% and 85.61%, and the carbon emission of the algae and moss crusts could account for 67.60% and 25.76% of the increased amount. And in the relative wet year (2018), the soil carbon emission of covered algae and moss crusts was increased by 139.37% and 290.53%, and the surface carbon emission of the algae and moss crusts could account for 69.09% and 45.59% of the increased amount. The development of biological soil crusts promoted the carbon release of soil. Temperature was the key driving factor for the diurnal dynamic change of soil carbon release in this area. Temperature drive the contribution rate of soil carbon release reached 48.89%. Therefore, in the process of calculating carbon exchange in desert ecosystems, the effects of different biological soil crusts on soil carbon release should be fully considered.