Abstract: In view of the test requirements for vertical high-order shock response spectrum (SRS) of large-sized structures, a two-point impact test technology based on the high-order gas gun impact test system was proposed by comparing various implementation methods of SRS tests. It is indicated by validation test that the boundary uniformity of vertical high-frequency and high-order impact tests for large-sized structures can be achieved by using the twin gas guns, avoiding the under-test problem related with single point SRS tests. It provides more realistic and reliable data for the spacecraft whole machine development. Meanwhile, featured with an expansion capability technically, the twin gas gun system may provide support for high-order SRS tests of even larger-sized products.