In order to predict the compressive strength of thin mortar masonry accurately,compression test of block masonry for 30 specimens was conducted. Based on the specification, a mathematical model of compressive strength of concrete masonry mortar layer was established, the failure process and failure mechanism of masonry compression were studied. The compressive properties of thin mortar and ordinary mortar masonry were compared. The results show that the model is feasible and the compressive strength of maso...