Abstract: The ancient wooden building is fairly valuable. Scientific understanding, intuitive expression and automatic information integration of the damage are conducive to better cultural inheritance. Although historic building information modeling (HBIM) technology has the characteristics of high correlation between model and information, and it can integrate information into the model, which is highly compatible with the requirements of the information expression integration of ancient buildings, there are still some problems in application, such as the fine division of damage model expression and the difficulty of the quick integration of a large amount of damage information. This paper takes the crack damage of ancient wooden buildings as an example. Firstly, the multi-Level of Detail (LoD) expression standard of crack model was proposed. Then, the information integration method of HBIM was analyzed in detail, that is, the component information is managed by electronic list in Revit. In order to solve the problem of the large amount of information, the secondary development of Revit was carried out by writing external commands and the software was loaded as an external application to automatically integrate and update information. Finally, the method was verified by an HBIM model of an ancient wooden building, and the automatic information integration of 64 pillars was completed within 4 seconds. It shows the efficiency and reliability of the multi-LoD expression method and information automatic integration algorithm, which can provide reference for the expression, integration and management of the information of historical buildings.

Key words: HBIM, crack, LoD, information integration, Revit secondary development