China Association for Science and Technology (CAST) announced the list of 95 papers included in "the 6th Excellent STM Paper Selection Program of CAST". Dr. Hongping Wang, Prof. Shizhao Wang and Prof. Guowei He's paper entitled "The spanwise spectra in wall-bounded turbulence" published in Acta Mechanica Sinica (AMS) win the award. The selected papers are representatives of excellent papers published in academic journals of China since 2017. AMS has been included in this program for six consecutive years. Congratulations to AMS and all the authors!