The child dummy is seeing increased use in car crash testing for safety reasons. A neck of the child dummy is one of the key components for dummy design, manufacturing and testing. The testing corridor would affect the all of the procedure for the neck. This paper would discuss the testing corridor for neck calibration of the child dummy.The testing corridors should be come from biomechanical results and combine with the material property. The paper has reviewed the research result and described the dummy neck of Six-Month, Twelve-Month, Eighteen-Month Old Infant (CRABI); Three-Year Old and Six-Year Hybrid III Child (Hybrid II Child dummy will not be discussed in the paper).A series of testing has been done for finding out corridors of the neck pendulum calibrating tests. It is difficulty to match the human corridors of crash reaction. There are several methods to approach the child neck corridors such as change design, adjust testing parameter and so on. A suggestion is included in conclusion for changing of the neck testing corridors by a biomechanical reason.According to testing results and data analysis, the new design neck has kept a stable and repeatable results to match the testing corridors.