Objective To find out the status of the prescription dosage of TCM decoction pieces in Jiading Hospital of Traditional Chinese Medicine(TCM) .Methods 1 000 prescriptions in 2013 were extracted ,frequency ,number of drug over-dosed ,dosage of poisonous TCM decoction pieces were analyzed .Results The total dose more than 300 grams of prescriptions accounted for 59.6% .The top 10 utility frequency of medicine were Glycyrrhizae radix et rhizoma ,Astragali radix ,Atractyl-odismacrocephalaerhizoma,Poria,Angelicaesinensisradix,Salviaemiltiorrhizaeradixetrhizoma,Paeoniaeradixalba, Coicis semen ,Eucommiae cortex ,Citri Reticulatae pericarpium ,which had varying degrees of overdose .Poisonous TCM de-coction pieces was also overdosed .Conclusion The issues of Chinese herbal medicine prescription was serious ,which need to be improved to ensure rational prescription drug safety .