With the rapid development of computer technology, software plays an important and decision-making role in the computer control system, especially in digital flight control systems. How to determine and improve the reliability of software is a critical problem demanding urgent solution. Traditionally, software reliability is determined according to a reliability model based on software testing data after the software has developed, which is not suitable for improving its reliability. This paper studies a method to predict the software reliability in the early development period so as to provide the basis for improving the reliability of software. Application to a digital control software system indicates that this method can predict the reliability of software in the early development period, especially in the requirement period and outline design period, effectively.
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