In order to solve the difficulties and problems such as low accuracy and low efficiency in current measure of cylinder head combustion chamber volume by titration method, a new method based on liner scanner three-dimensional measuring system was proposed. The volume of cylinder head combustion chamber can be measured rapidly and precisely with the proposed method. Besides, the method has been applied in actual engineering. In this article, the measuring principle and process were introduced, and the key method was expounded for getting cylinder head combustion chamber volume through a series of filtering and volume compute procedures, including point cloud filtering, hole fixing, surface reconstruction, extraction of effective point cloud and volume compute, etc. Lastly, based on the prototyping platform, the method has been verified.