Abstract: 【Objective】 The uncertainty of migratable chromium is an important indicator for the confidence and accuracy of the test results. In order to master the method of testing the uncertainty in paint coatings on bamboo furniture，an evaluation technique for the uncertainty of migratable chromium was explored and established through the spectral analysis of ICP.【Method】 Through the comprehensive measurement of sample pretreatment，repeatability measurement，sample weighing and the test of the volume of hydrochloric acid，the concentration and dilution factor of the sample solution etc.，the study establishes an analytical mathematical model and evaluates the analytical uncertainty.【Result】 The results show that measurement repeatability and sample concentration are the main factors that cause uncertainty during the measurement process，especially in the fitting process of standard curves，the uncertainty generated has the greatest impact. 【Conclusion】 Measurement of migratable chromium needs to strictly follow the standard of solution preparation and standard curve fitting. At the same time，it's required to reduce the operation steps，increase the number of test repetition，and accordingly the uncertainty in the sample testing process will be reduced.