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The physical and chemical properties of prestellar cores, especially massiveones, are still far from being well understood due to the lack of a largesample. The low dust temperature ($<$14 K) of Planck cold clumps makes thempromising candidates for prestellar objects or for sources at the very initialstages of protostellar collapse. We have been conducting a series ofobservations toward Planck cold clumps (PCCs) with ground-based radiotelescopes. In general, when compared with other star forming samples (e.g.infrared dark clouds), PCCs are more quiescent, suggesting that most of themmay be in the earliest phase of star formation. However, some PCCs areassociated with protostars and molecular outflows, indicating that not all PCCsare in a prestellar phase. We have identified hundreds of starless dense clumpsfrom the mapping survey with the Purple Mountain Observatory (PMO) 13.7-mtelescope. Follow-up observations suggest that these dense clumps are idealtargets to search for prestellar objects.

Follow-up observations toward Planck cold clumps with ground-based radio telescopes