A survey toward 674 Planck cold clumps of the Early Cold Core Catalogue ( ECC ) in the J=1-0 transitions of ^ { 12 } CO , ^ { 13 } CO and C ^ { 18 } O has been carried out using the PMO 13.7 m telescope .
673 clumps were detected with the ^ { 12 } CO and ^ { 13 } CO , and 68 \% of the samples have C ^ { 18 } O emission .
Additional velocity components were also identified .
A close consistency of the three line peak velocities was revealed for the first time .
Kinematic distances are given out for all the velocity components and half of the clumps are located within 0.5 and 1.5 kpc .
Excitation temperatures range from 4 to 27 K , slightly larger than those of T _ { d } .
Line width analysis shows that the majority of ECC clumps are low mass clumps .
Column densities N _ { H _ { 2 } } span from 10 ^ { 20 } to 4.5 \times 10 ^ { 22 } cm ^ { -2 } with an average value of ( 4.4 \pm 3.6 ) \times 10 ^ { 21 } cm ^ { -2 } .
N _ { H _ { 2 } } cumulative fraction distribution deviates from the lognormal distribution , which is attributed to optical depth .
The average abundance ratio of the ^ { 13 } CO to C ^ { 18 } O in these clumps is 7.0 \pm 3.8 , higher than the terrestrial value .
Dust and gas are well coupled in 95 % of the clumps .
Blue profile , red profile and line asymmetry in total was found in less than 10 % of the clumps , generally indicating star formation is not developed yet .
Ten clumps were mapped .
Twelve velocity components and 22 cores were obtained .
Their morphologies include extended diffuse , dense isolated , cometary and filament , of which the last is the majority .
20 cores are starless .
Only 7 cores seem to be in gravitationally bound state .
Planck cold clumps are the most quiescent among the samples of weak-red IRAS , infrared dark clouds , UC H ii region candidates , EGOs and methanol maser sources , suggesting that Planck cold clumps have expanded the horizon of cold Astronomy .