Abstract: To evaluate the effect of baled TMR (total mixed ration) on lactation performance, apparent digestibility and blood metabolites, twenty-four Holstein cows at mid-lactation stage (124±20 days in milk) were randomly assigned to two groups for a 10-weeks feeding trial. In the control, 12 cows were fed by traditional separate feeding of forage and concentrate while the other 12 cows were fed directly by baled TMR feeding. The ingredients and nutrient composition of the diets were the same in both the separate feeding and baled TMR feeding. The forage to concentrate ratio in the diets was 50∶50, and the moisture content of baled TMR was 50%.The baled TMR feeding significantly increased dry matter intake (P<0.05) and numerically increased the milk yield (7.69%) and 3.5% fat corrected milk (5.20%) compared with the separate feeding. No significant differences occurred in milk composition and nutrient production between the baled TMR feeding and the separate feeding. The apparent digestibility of crude protein and ether extract was significantly increased in the baled TMR feeding group (P<0.05), and an increasing trend occurred in the apparent digestibility of dry matter (P<0.1). The baled TMR feeding method significantly reduced the blood urea nitrogen content in blood serum, but the effect on other blood indices was similar to that of separate feeding. In conclusion, baled TMR technology can be an effective method of total mixed ration distribution and should be promoted in small and medium-scale dairy farms to improve their performance and income from dairy production.