This paper presents experimental data of material testing of lime plaster joint of some historical brick buildings on the same site. The data of shear strength, tensile strength and compression strength were obtained through the test. The following observations are notable: 1) The lime plaster joint of some buildings which were built at a different time indicates the different capacity; 2) The shear, tensile and compression strength clearly correlate one another. As tensile strength is low, shear strength and compression strength are also low; 3) The relation expressions of tensile strength and shear strength were proposed in this paper.