Abstract: In order to understand the rock mass deformation characteristics in densely fractured zone of high pressure tunnel in Shenzhen Pumped Storage Power Station, the borehole deformation and rock acoustic test were carried out to the tunnel surrounding rock mass before lining, and the test results were compared with bearing plate deformation test in the earlier exploratory stage. The influence of fracture occurrence on test results is analyzed and it is concluded that the steep dip fracture has significant influence on borehole deformation test and the deformation modulus in fracture zone is usually decreased. The research results can be a reference for the accuracy and representativeness improvement of in-situ rock deformation test.