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In order to solve bad quality problem of high speed digital signal, in radar high speed digital circuit module(based on VPX bus)’s high speed digital interface testing, it analyzes the reason and introduces a solution to keep signal integrity of high speed signal in testing. It is avoiding multi-output in high speed signal connection circuit. Experimental results show that high speed signal quality of single-output interface is much better than multi-output interface. The signal error rate is improved e_¹⁰ times. Through Eye-diagram measure, for 1.25Gbps signal rate testing, single-output high speed signal eye height is 8.9uW, eye width is 730ps. However, multi-output signal cannot form an eye figure. All above validate that to ensure signal integrity in high speed digital signal testing should avoid multi-output.