Abstract:To explore out the key technology of preparation of ultra -fine fresh bone powder （UFFBP） of Pingliang Red Bull， used L9（34） orthogonal test evaluation index of bone grain fineness to study ultra-fine fresh bone powder of Pingliang Red Bull production optimum process conditions. The bone after cleaning to miscella－ neous， low temperature freezing， primary crushing， high-temperature cooking after eliminating lipid process such as pretreatment， colloid mill was a key link in the process of ultrafine， primary and secondary factors af－ fecting red bull bone ultrafine production， followed by gear grinding clearance， glue grinding times， primary particle size， high pressure time. The optimum technological conditions for grinding clearance was 5 μm， 3 times the glue grinding times and primary particle size 5 cm and 90 min high-temperature cooking， could get the fine fresh bone powder of size 15.0 μm. The result showed that the bone of Ping-liang Red Bull by 15.0 μm ultrafine fresh bone powder could be up to 12 577.15 mg/100 g of calcium content， phosphorus content was 5 051.3 mg/100 g， protein and fat content of 10.4 % and 6.7 %， respectively， had reached a higher level， was extremely valuable for development and utilization.