The current lack of reliability test design was analyzed by considering two types of risk(producer's risk and consumer's risk)
and the optimization reliability test design modeling based on information fusion (ORTIF) was constructed. Also
the requirements and constraint conditions of reliability test design were analyzed
the information fusion technology between subsystems and systems was presented on the basis that the prior distributions were Beta distribution. According to posteriori risk criteria
the definition of producer's risk and consumer's risk were given. The solution steps of optimum test plan were given by Matlab software. At last
an example of liquid rocket engine was given. The optimum test plan (9
5
10
6
1) and its cost of 3326.9 were obtained respectively
and it was also concluded that the weight plan has a great influence on the optimum test plan.