Abstract: The high on-way resistance along the pipeline system usually leads to some problems like pipeline explosions and leakage at joints etc.，which have posed a serious restriction on the development of paste backfill technology.Taking the paste slurry with the poor rheological properties from a copper mine as a case，some pumping aid was added to improve its rheological properties on the basis of achieving the required filling strength and pumping acquirements.Then，contrast was made with the paste without pumping aid，and the effect of time on rheological properties of the paste slurry with pumping aid added was analyzed.The testing results indicated that，the paste made from full tailings conformed to Bingham features.The addition of pumping aid lowered the effect of concentration on rheological properties，which made the concentration of the paste slurry increased to 78% under the condition of meeting the transporting requirements.Combining with the theoretical analysis，the effect of pumping aids on drag reduction and the mechanism of slump loss of paste slurry after a long time were discussed.It is considered that pumping aid has a dramatic effect on reducing on-way resistance along pipelines and decreasing the abrasion of pipeline with less negative effects.

Key words: Paste pumping, Rheological properties, Drag reduction, Pumping aid, Slump loss