Impact acceleration is a vital parameter to airdropped mine system design, which has strong relation to the mechanical parts’ action. Airdropped mine’s drop, parachute release, water entry will generate slow and fast accelerate signals. Overrun of data memory will occur with constant frequency sample. Traditional data compression methods can not be used in a tiny storage test and measurement system due to its limited hardware and power supply. The paper introduces a variable time interval of data storage algorithm which can be fit into a low power CPLD chip. The algorithm analyzes data’s change from a ADC at high speed sampling, and changes the time interval of data storage automatically. It reduces the data storage capacity while keep enough information for both slow and fast accelerate signals. An airdropped mine’s accelerate build-in measurement system based on this algorithm has been build. Test results show that it works well and can be used for other dynamic measurement applications