Product-packaging system must survive the environmental hazards experienced during transport and distribution. This paper deals with the design and evaluation method for transport packaging protection. Firstly, just right transport packaging evaluation system is studied and established, which includes four evaluation sub-modules such as packaging reliability, packaging convenience, packaging cost rationality, and environment protection. Then, the improved design method for transport packaging protection with just right transport packaging evaluation system is put forward on the basis of the concept of just right transport packaging and the requirement of environment protection. The improved design and evaluation method can effectively predict and control over-packaging and under-packaging, and is useful to realize just right transport packaging. The research work would provide instruction for the design and evaluation of transport packaging protection of product.