Abstract: Knowing the historical way of measuring is crucial for the success of any study on traditional Chinese construction; and knowing the standard ruler-length is a prerequisite to study historical measurement techniques. This paper discusses three basic ways to obtain the rulerlength and investigates the phenomenon of “multiple rulers used in one place” from the perspective of village construction. The paper then identifies two main approaches to the use of the construction ruler: using whole numbers, or rounding the numbers (yabai technique).