The availability analysis of the CNC lathe is the basis of formulating the growth measures of availability. So, how to carry on the availability analysis accurately and reliably is the key content of this paper. The traditional methods of the availability research of CNC lathe, are mainly the single factor analysis, which results are often had error with the customer demand. Based on this, using the idea of QFD for reference, the paper 〖JP3〗will take into account the customer demand information, the relationship of the CNC lathe’s subsystem, and the correlation between the customer demand and the subsystems uncertainty to establish the DHOA model. To solve the DHOA’s 〖JP2〗output, the paper will transform DHOA into the matrixform, in order to simplify the calculation. According to the calculation results, we can determine the direction of the improving of availability. So the minimum improvement work input will receive the maximum customer demand, in order to improve market competitiveness of products availability.