A data acquisition system for testing gas sensor array response to multi-gas is presented.The testing system is based on the character of the gas response of metal oxide semiconductor gas sensor array.The data acquisition is realized automatically through the real time controlling of the data acquisition card PCI1711.This system is highly attractive for electronic nose,which is a powerful tool for the discrimination of gases. A data acquisition system for testing gas sensor array response to multi-gas is presented. The testing of the gas system is based on the character of the gas response. data acquisition card PCI1711. This system is highly attractive for electronic nose, which is a forcing tool for the discrimination of gases.