The compression forces on disc of spine were recommended from The National Institute for Occupational Safety and Health (NIOSH). The safety level for disc compression forces during lifting object in manual material handling should less than 3,400 N. There are many studies about disc compression forces in manual material handling, but manual human handling less researched. The aim of this study is to compare L4/L5 compression forces in four manual human lifting techniques and three phases of lifting and transferring. Thirty two subjects lifted a 60±5 kilogram person in four techniques: two-handed seat carry, four-handed seat carry, Fore-and-Aft carry and Chair carry from table height 50 cm walked 9 m, rested 3-5 minutes between each technique. Lifting and transferring was divided 3 phases (origin lift, carry and destination lift). Five cameras were installed in different angle of views to record subject movement during lifting. The static mode of the University of Michigan's Three-Dimensional Static Strength Prediction Model (3DSSPP) was used to predict lumbar disc compression forces (L4/L5) in each technique during lifting. Only origin lift phase has the average maximum L4/L5 compression forces more than 3,400 N especially Two-handed seat carry and Four-handed seat carry techniques. The results of L4/L5 compression forces of manual human lifting might help to prevent lifters or authorities from back injury.