The efficiency of computer is getting better and better today. So the thing that we collect the experiment data is convenient and precise by using computer. I design some instrument to collect data. Analogy signal is got by pressure sensor. The instrument helps me transforming Analogy signal to Digital signal and amplifying signal. I research Bernoulli's equation and kinetic theory of gases and do some related experiments to observe. Finally, I discussion theoretical value and experimen value and find some physical phenomenon.