In order to solve problem that few flow standard device is able to test infusion pump analyzer at present

a apparatus active piston based is proposed.The principle and structure of the calibrating device is described.A system for data acquisition and automatic control is designed.An upper computer is used to control workflow and acquire instantaneous flow and other signals.The verification experiment proves that

for flow range 0.1

1

0 mL/h

the precision of the analyzer reaches 2 %.Uncertainty factors that affect flow calibration of infusion pump analyzer are analyzed and the extension uncertainty equal to 2.4 %（k=2）.The result shows that this apparatus has characters of good practicability and wide application prospect.