Abstract: The solution of freezing temperature field under effect of seepage is a kind of multi-field coupling, and the moving boundary, phase change, internal heat source, temperature field and seepage field affect each other. A model coupled seepage and temperature with phase change of fractured rock mass without filling was established.The influence of spacing of frozen tubes on the evolution of frozen walls under the function of seepage of fractured rock mass without filling was studied by single factor method. The results show that the spacing of frozen tube and the frozen wall closure time can be fitted with an exponential function. The larger the freezing tube spacing, the longer the frozen wall closure time, the larger the increase and the longer the freezing time required to form same interface frozen wall thickness; there is a critical value for the spacing of the frozen tubes, after this value is exceeded,the freezing time required for forming the same interface frozen wall thickness increases sharply with an increase of the spacing of freezing tube, and the longer the spacing of freezing tube, the longer the freezing time required to drop the average temperature of frozen wall to the designed temperature.