Using 13.7 m telescope of Qinghai station of NAO, PMO at Delin Ha, 43 IRAS sources were mapped with 13CO J=1-0 C18O J=1-0 and CO J=1-0. Each source has one or more cores. The distances of these cores range from 1 pc to several pc, and the masses from 102M⊙ to 105M⊙. High velocity outflows were detected. The mass, momentum and energy of these massive cores are larger than those of the low mass ones. With radio, IRAS, MSX data, stellar source distribution were investigated, and sourceless cores that deviate from infrared sources were identified. They are potential high mass star formation sites.

• WEI Y.(Astronomy Department, Peking University)
• WU Y.(Astronomy Department, Peking University)
• WANG Y.(Astronomy Department, Peking University)
• Xu D.(Astronomy Department, Peking University)
• Ju B.(Qinghai Station, Purple Mountain Observation)