Abstarct: Roof falls continue to be one of the greatest hazards faced by underground coal miners. For preventing unpredictable hazards and losses due to roof falls, assessment of roof rock behaviour in coal mines plays an essential role in ground control issue. However, baxsed on the intensive reserchs in this area, various parameters influence the roof rock behaviour of the stratified rock mass. To identify the parameters that had the greatest degree of influence on the deformation of the stratified rock mass, In this research, using the experience of many geologist and mining engineers that have been worked for many years in East Albors coal mines six independent parameters were identified as being of the most influential on the processes of strata deformation which were namely; the unconfined compressive strength of the intact rock, the tensile strength, the bedding thickness characteristics, the joint properties, joint orientation and how sensitive the rock type was to changes in moisture content. From above mentioned parameters one of them, which is extremely important to coal mine ground control, is moisture sensitivity. Because many coal seams have immediate roofs with moisture sensitivity and weak shale compositions. Presence of moisture sensitivity mud rocks can cause ground control problems. They can severely damage the roof by reducing rock strength, and generating swelling pressures. Therefore, in roof rock assessment, moisture sensitivity is the factor, which must be assessed carefully and with high accuracy. Although slake durability test (SDT) has been widely used to evaluate moisture sensitivity of mud rocks, this method is a laboratory test and is a time consuming method. Furthermore in this method, rock samples must be carefully wrapped to maintain in situ moisture content. Therefore, determination of an index that can easily measure this parameter in situ and with high accuracy has great importance. Immersion test is a simple method which can easily determine this index. In this research, to compare the slake durability and immersion test and establish the relationship between the two tests, rock samples were collected from various mines of East Alborz coalfield. These samples tested with two methods. According to these analyses, a high correlation was found between the two tests.