Abstract: In order to simulate the effect of edge loads on the bearing capacity of mudstone,improved rock plate loading test and carried out four pilot sites weathered mudstone rock loading test on a project site in Chengdu Tianfu new area and obtain the corresponding p-s curves.Experiments show that:①Under the condition of applying 200 kPa edge loads,the bearing capacity of mudstone has the 0.7 to 0.9 times increase compare with applying no edge loads,there needs to have the modification of depth for mudstone.Also try to get an appropriate depth modified coefficient in this paper.②Combining the rock loading test results with the results of indoor rock uniaxial compressive strength test,to do inverse computation of reduction factor according to the standard method which draw the conclusion that the value of the standard proposal is conservative.When the bearing capacity of mudstone in Chengdu is determined by the uniaxial compressive strength test,the value of reduction factor could be improved appropriately.