Research conclusions: The section design of railway tunnel for heavy haul traffic based on the Taihangshan mountain tunnel for mixed passenger and freight traffic is basically feasible．The simple grate layer should be canceled to the railway tunnel for heavy haul traffic．The invea should be installed when the surrounding rock grade is m or above．The ratio of rise to span and the depth of the invert should not be lower than the standard for passenger dedicated line tunnel．Lots of tests on site and measurements must be done before working out the tunnel technical standard under 30t axis load because of the complexity of train load and variance of the surrounding rock．