Currently some popular BIM modeling softwares seldom take into account the requirements of decoration engineering. As an important part of architechture construction engineering, decoration engineering's BIM application is still on the way of exploration, which directly results into the incomplete application of BIM in architechture construction. In this study, SketchUp, which is very popular in decoration engineering, is used as a modeling software to explore modeling methods and application motheds in a decoration project. As a result, the author realized a seamless smooth connection of BIM data produced in both decoration design stage and construction stage. At the same time, the author also uses the plug-in software 5D BIM for Sketchup, so that all the information concerning the materials could be read and calculated, and the construction scheduling as well as costs get controlled. In brief, the study disscusses a low cost BIM techonology application model which is applicable in China's decoration engineering, and also presents an example of its application.