Abstract: In order to determine the stability of the NAND Flash image recorder and the peak recording speed, reducing the amount of manual testing, a new load test system was designed. To solve the problem of stability test, speed load model based on exponential regression and test time control model based on the lognormal distribution were proposed. To test the peak recording speed, the test methods combining hardware with software based on climbing search algorithm and speed dichotomy was praser. The hardware data generator was designed, whose speed was software adjustable according to valid data duty cycle mechanism. Climbing search algorithm rough determined the peak recording speed range, and then the speed dichotomy approached the peak recording speed; the test report was transferred to PC for display through the serial port and Gigabit Ethernet. Experimental results show that the speed load regulation accuracy is up to 0.1MB/s; the speed load range is from 0 to 1 600 MB/s; verification of read back data using hardware has no clock delay; the tested NAND Flash recorder connecting with 8 SLC NAND Flash chips has the peak recording speed of 240.12 MB/s; under the speed load 200 MB/s, the NAND Flash record controller can work well continuously for more than 24 h. The load test system can be used for load test of other transmission and recording system because of its universal architecture.