Abstract: Ground meat's quality is not only determined by the physical properties of the meat, but also correlated closely to the operation condition of screw conveying system of meat grinder during grinding process. In order to examine the effect of screw conveyor's rotate speed on grinding quality for meat, an experimental study was put forward under different operating speeds.Many biochemical parameters for quality evaluation of ground meat and corresponding test methods were introduced, such as p H, total volatile basic nitrogen ( TVB- N) , water- holding capacity and color.Results showed that conveyor's rotate speed had no significant effect on p H and TVB- N of ground meat with the elongation of storage period. There was a relatively stable state with the changing of p H values of ground meat, while TVB- N values of ground meat collected from different rotating speeds had an upward trend with the elongation of storage period. It also showed that rotating speeds of screw shaft also had no significant effect on water- holding capacity and color of ground meat.There was a similar trend in the lost process of water of ground meat from different conveyor's rotate speed.For tested meat grinder, optimum operating speed on pork and beef is 140 r / min and 160 r / min respectively.