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The design technique for 64 channels ultra high speed synchronous transient testing system with data sampling frequency from 2MHz to 10MHz is introduced. It includes two kind of hardware architecture and software architecture of ultra high speed transient testing system. For hardware architecture,the mode based on PXI express bus data transmission and RAID array stream disk data saving and the mode based on large capacity on-board cache data saving and bus downloading transmission are introduced in detail. For high performance system software design,the design technique with application of producer/consumer architecture and finite state machine is described. And it provides solutions for some system software design key problems of dozens of GB mass data saving and recalling and multi-channel signals displaying.Based on this technical scheme,64 channels synchronous continuous test system that stream disk speed of 256MB/s and test time up to five minutes and ultra high speed transient test system that sample frequency of 10MHz/Ch and test time up to 6.4 s are designed,they can meet variety of application of transient test.