After discussing the major factors affecting model-based creep experiment and the rules to dispose in designing experimental model,the needed similarity relationship for constructing models is presented,then the similarity relationship of cambers due to creep between model and original is put forward based on creep expression in CEB-FIP Model Code 1990.The comparison between deduced values from experimental data and tested resultants in original bridges shows that deduced values hold agreeable precision.This paper provides novel train of thought to model-based creep experiment while adopting non-full dimension model,and the established formulae are useful in engineering research.